The annelid is able to distinguish the beetle when it is several inches distant, and the change from an animated worm to a seemingly lifeless thread is startling in its exceeding rapidity.
There is a small fresh-water annelid which practises letisimulation when approached by the giant water-beetle.
The most popular of these hypotheses was the annelid theory, which derived the Vertebrates from the Worms.
Defn: Any annelid resembling Nereis, or of the family Lycoridæ or allied families.
Defn: A large marineannelid (Nephthys cæca), inhabiting the sandy shores of Europe and America.
Defn: A form of annelid larva having cilia on the ventral side.
Defn: Any annelidwhich constructs a tube; one of the Tubicolæ.
Defn: That portion of the head of an annelid situated in front of the mouth.
Defn: Any marine annelid of the genus Hyalinæcia, especially H.
Defn: A large marine annelid (Arenicola marina) having a row of tufted gills along each side of the back.
The actions of all animals below the annelid are mainly reflex or automatic, unconscious and involuntary.
Between the turbellarian and the annelid many aberrant lines diverged.
The skeleton is a thickening of the horny cuticle of the annelidon the surface of each segment.
But you may ask, if we are to worship a personal God, why might not a conscious and religious hydra, with equal right, worship an infinite stomach, and the annelid a god of mere brute force?
The annelid had fin-like parapodia, approaching the legs of insects about as closely as the fins of a fish approach the legs of a mammal.
In the schematic worm and annelid the reproductive system is simpler, though perhaps equally effective.
The eye of the turbellaria distinguishes only light from darkness, that of the annelid is a true visual organ.
To begin with less characteristic organs the digestive system is much like that of the annelid or schematic worm, but with greatly increased glandular and absorptive surfaces.
But in the annelid the mouth is on the second segment; here it is on the fourth.
The study of the insect will show us clearly the advantages and defects of the annelid plan.
The annelid added segmentation, and thus greater freedom of motion by the parapodia.
So in the hydra and the annelid you must look at the possibilities of the nervous system before you or he think that digestion and muscle are all.
They transformed the annelidparapodia into legs and developed wings.
This period extends from the beginning of life up to the time when the annelid was the highest living form yet developed.
The annelid had teeth or claws attached to the proboscis.
While grazing these rocky slopes lost under the waters, I still spotted some seashells, tube worms, lively annelid worms from the genus Spirorbis, and certain starfish specimens.
Pinnixa cylindrica/, a related species, lives in the tubes of large annelid worms as a commensal.
The fact--and it is a fact--that an annelid should observe lunar time would not be very remarkable in itself, but it seems that the Mbalolo observes solar time as well.
The mbalolo is a marine annelid about six inches long and of the thickness of vermicelli.
The recent Survey explorations would seem to point to their being simply very much squeezed annelid "pipes.
This Quartzite, with itsannelid borings and fucoid beds, is placed by Murchison in the Silurian series, the third in the geological record.
These are, it is safely concluded, "infillings of excavations" made by certain worms called Annelids, and are known as Annelid Borings.
The primitive Annelid mouth, however, does not appear in the embryogeny of Vertebrates, for the great development of the brain crowds it out of existence.
If Vertebrates arose from primitive Annelid ancestors, how account for Amphioxus and the Ascidians, which seem to be the most primitive living Vertebrates and yet show no particular annelidan affinities?
Both laid great stress on the fact that the main organs in Vertebrates are arranged in the same way as in an Annelid lying on its back, the nervous system being uppermost, the alimentary system coming next, and below this the vascular.
The Annelidtheory of Dohrn and Semper was perhaps not so widely accepted as the rival Ascidian theory, but it counted not a few adherents and gave a certain stimulus to comparative morphology.
If the Vertebrate is conceived to have evolved from a primitive Annelid which took to creeping or swimming ventral surface uppermost, a difficulty at once arises with regard to the relative positions of the "brain" and the mouth.
Dohrn assumed also that the primitive Annelidancestor must have possessed a notochord to give support in swimming.
This was the so-called Annelid theory of Dohrn and Semper.
Dohrn conceived that the transformation of the Annelid into the Vertebrate took place mainly by reason of an important transforming principle, which he calls the principle of function-change.
The Annelid theory was firmly supported by Eisig, who in his elaborate monograph on the Capitellidæ[410] maintained against Fürbringer the genetic identity of the Annelidan nephridia with the kidney tubules of Vertebrates.
A form of annelid larva having cilia on the ventral side.
That portion of the head of an annelid situated in front of the mouth.
Any annelid which constructs a tube; one of the Tubicol\'91.
We see this realized in annelid worms known by the name of Heteronereidae.
He is not so much of an anchorite as he appears to be, for by his side an annelid usually instals himself as a messmate, which forms with the Pagurus one of the most terrible associations that are known.
It is probable also, as already mentioned, that the leaf-like appendages of the Phyllopoda are of a primitive type, and attempts have been made to refer their structure to that of the Annelid parapodium.
The resemblances between the Crustacea and the Annelid worms, in such characters as the structure of the nervous system and the mode of growth of the somites, can hardly be ignored.
But the same may be said of every single arthropod and annelid if it be meant that all these organs are not contained in every possible slice.
But how can we see any trace of an Annelid ancestor in the vastly different frames of these animals which are said to descend from it?
It was assumed that some Cambrian or Silurian Annelid obtained this stiffening rod of cartilage.
We shall see that there is most remarkable evidence connecting the highest of the Arthropods, the insect, with a remote Annelid ancestor.
In form they resemble teeth, but their structure is different from that of the teeth of any fishes, agreeing with that of the teeth of annelid worms.
Claus considers that although these organs formed an excretory system, it is not possible to compare them with the annelid segmental organs, because he thought the cells in question arose from ectoderm.
The strength of the first theory is essentially based on the comparison of the vertebrate central nervous system with that of the segmented invertebrate, annelid or arthropod.
He simply, therefore, substituted Arachnid for Annelid in the old theory.
Wilson’s study of the cell-lineage of the Annelid *Nereis* being the first of them.
Now all these difficulties vanish, if we consider the regeneration of animals, such for instance as many worms of the annelid class or our familiar ascidian *Clavellina*, in which regeneration in both directions is possible.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "annelid" in a variety of sentences. We hope that you will now be able to make sentences using this word.
