On theMollusca of the Pleistocene Gravels in the neighbourhood of Cambridge," by Mrs McKenny Hughes.
I remember land shells being common of which it is difficult now to find live specimens, and my wife[6] has shown how the mollusca are being differentiated in isolated ponds left here and there along the ancient river courses above the town.
Ray Lankester, as shedding great light on the affinities of the Mollusca with other groups.
Of terrestrial Mollusca we enumerate the following Limacidæ--Arion ater, A.
I may add that, in Professor Forbes's opinion, the above-enumerated species ofmollusca probably did not live at a much greater depth than twenty fathoms, that is only 120 feet.
Orbigny has been so obliging as to name for me the twenty species of Molluscaembedded in the two gravel beds: they consist of:-- 1.
Comparative ranges of the extinct and living molluscaon the West Coast of S.
It is certain that the gravel-beds and intermediate red mud were deposited within the period, when existing species of Mollusca held to each other nearly the same relative proportions as they do on the present coast.
Not only has this amount of elevation taken place within the period of existing Mollusca and Cirripedes; but their proportional numbers in the neighbouring sea have in most cases remained the same.
Julian in Patagonia, age of, subsequent to living molluscaand to the erratic block period.
It would, indeed, have been a great anomaly if there had been a true passage between a deposit contemporaneous with existing species of mollusca, and one in which all the mollusca appear to be extinct.
By the term "recent," I refer only to that period within which the now living mollusca were called into existence; for it will be seen in the Fourth Chapter, that both at Bahia Blanca and P.
Inferior tertiary strata, variation of, connected with volcanic action; Macrauchenia Patachonica at San Julian in Patagonia, age of, subsequent to living mollusca and to the erratic block period.
I SHALL treat of the Mollusca before the Articulata, because as a group their intelligence is not so high.
But this probably arises from the sense of discomfort due to exposure of their skin to the air; and if we can call it an 'idea,' it is doubtless shared by all other aquatic Mollusca when exposed to air.
Defn: A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc.
Defn: An order of gastropod Mollusca having a heart with two auricles and one ventricle.
Defn: An extensive division of gastropod Mollusca in which the loop or visceral nerves is twisted, and the sexes separate.
Defn: A class of Mollusca in which the anterior lobes of the foot are developed in the form of broad, thin, winglike organs, with which they swim at near the surface of the sea.
Defn: A class of marine cephalate Mollusca having a tubular shell open at both ends, a pointed or spadelike foot for burrowing, and many long, slender, prehensile oral tentacles.
Defn: An order of lowly organized Molluscabelonging to the Isopleura.
Defn: A genus of bivalveMollusca which includes the true oysters.
Defn: The division of Molluscawhich includes the land snails and slugs.
Defn: An order, or suborder, of gastropod Mollusca in which the gills are usually situated on one side of the back, and protected by a fold of the mantle.
But as yet our knowledge of the conditions of life of the marine mollusca and of their distribution is extremely scanty.
On the Pleistocene (non-marine) Molluscaof the London District, "Proc.
Professor Credner's contention, that marine mollusca are always absent from these relict lakes, seems at first sight a stumbling-block to the theory.
A number of Mollusca are mentioned which from their range likewise indicate a Lusitanian origin.
I cannot leave the consideration of the mollusca without referring to the fact that there appears to be a very important centre of distribution in South-eastern Europe.
This opinion is based upon the fact that in the upper strata of the enormously thick Sicilian pliocene deposits are found a number of arctic or subarctic species of mollusca which are entirely foreign to the Mediterranean fauna.
That such a migration actually occurred is further made probable, judging from the presence of American mollusca in the Crag deposits on the east coast of England.
But in the higher animals this is rarely found, only in the small animals of simple construction (such as the rotifers and other vermalia, and the smallest specimens of the mollusca and articulata).
In the molluscathere are usually a pair of comb-shaped gills near the heart; in the articulates there are several pairs, repeated in the different segments of the body.
Wollaston speaks strongly about the intermediate grade between two varieties in insects and mollusca being often rarer than the two varieties themselves.
Think how little some, indeed many, molluscahave changed.
I am very much obliged for your paper on the Mollusca (33/2.
Silurian Mollusca are common to both sides of the Atlantic.
The mollusca of the Tertiary deposits of the Paris basin became, in the hands of Lamarck, the basis on which invertebrate palaeontology was founded.
Now, of all the marine tribes which live within the juxta-terrestrial belt of sedimentation, unquestionably the Mollusca stand in the place of pre-eminence as regards their aptitude for becoming fossils.
Some mollusca bore into stone or wood and by the number of contiguous perforations greatly weaken the material.
All turtles have beaks; but the loggerhead has the most powerful set of jaws, which enables it to crush the shells of mollusca of large size with as much ease as a man can crack a nut.
The branch Mollusca is divided into five classes, three of which include the more familiar kinds.
I think, considering the organization of these mollusca and crustacea, and looking at their very complex nature, that it does indeed require a very strong imagination to conceive that these were the first created of all living things.
Shelly limestones may consist of mollusca or of brachiopoda, the former being common in limestones of all ages while the latter attained their principal development in the Palaeozoic epoch.
The chalk in very great part consists not of entire shells but of debris of foraminifera, and mollusca (such as Inoceramus, &c.
Fresh-water limestones are mostly of this class and contain shells of those varieties of mollusca which inhabit lakes.
The species of the Silurian molluscahave changed, but mollusca of Silurian type abound at this hour.
Take, for example, the case of the land mollusca of the Sandwich Islands.
The example of the mollusca of the Sandwich Islands is by no means a solitary one.
He discovered that the land mollusca of the Sandwich Islands fall into a great number of varieties.
Bivalve and univalve mollusca seem to be rare at the greatest depths; but starfishes, sea urchins and other echinoderms, zoophytes, sponges, and protozoa abound.
This invasion of the land was prefaced by a previous invasion of the Cretaceous sea by modern forms of mollusca and fish.
Imbedded in the same matrix occur several genera of mollusca undistinguishable from those inhabiting Maryvale Creek.
It is well known that the shells of land-mollusca are affected by the abundance of lime in different districts.
Huxley applies the same principle in accounting for the remarkable, though normal, differences in the arrangement of the nervous system in the Mollusca, in his paper on the Morphology of the Cephalous Mollusca in 'Phil.
The eggs of the univalve Mollusca are hardly less varied in the shapes they take.
In variety, in this connexion, the Mollusca must perhaps be given the first place.
The generation and development of reptilia and mollusca may be better studied by the use of jars for the specimens, than by their immersion in the aquarium.
Its water contains so much salt, that neither fish nor mollusca can live in it.
Very soon afterwards a mollusca had been captured, and placed in a tub filled with sea water.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "mollusca" in a variety of sentences. We hope that you will now be able to make sentences using this word.
