The animals are remarkable for a pair of broad, flat, natatory organs or membranaceous fins, from which the family derives its name.
The animal makes use of the valves of his shell as natatory organs, working them like fins or paddles, and by this means proceeding at a rapid rate through the waters.
They may, however, be natatory as in many Ostracoda and Copepoda, or prehensile, as in some Copepoda.
Underneath the natatory feet, and between the above-mentioned chitinous lamellae, the cirriform feet are formed; and on their completion the natatory feet become thrown off and replaced by the permanent feet.
They are regarded by Claus as representing the five pairs of natatory feet of Copepoda, and the generative appendages of the segment behind these.
The early appearance of the appendages of the sixth abdominal segment is probably correlated with their natatory function in connection with the tail.
There are six pairs of thoracicnatatory legs (Darwin, No.
Between the natatoryfeet are delicate chitinous lamellae, in the spaces between which the cirriform feet of the adult become developed.
In this form the feet remain for a very long time, whilst the abdominal appendages grow into powerful natatory organs, and the eyes, which at first seemed to me to be wanting, into large hemispheres.
The maxillipedes, of which the third pair is often still wanting, are not yet brought into the service of the mouth, but appear in the form of biramose natatory feet.
The antennae, organs of the mouth, and natatory feet, exhibit the same structure.
The sole distinction, that in the latter there are only 3 setae at the end of the outer branch, whilst in the Cirripedia there are 4 on the first and 5 on the following natatory feet, may be due to an error on my part.
In the Cyclopidae the posterior antennae have lost their secondary branch, and the mandibles have completely thrown off the previously existing natatory feet, whilst in the other families these appendages persist, more or less altered.
The middle region of the body bears notopodeal fasciae of long, fine, simple, natatory setae in addition to the compound neuropodials.
Parapodia uniramous with setae all compound, or in the epitokous phase with long simple natatory setae in notopodia of middle region of body.
Confident in his natatory powers, he had at first believed this feat to be not only possible, but probable and easy.
I have named the flying-fish, in order to direct the attention of naturalists to the enormous size of their natatory bladder, which, in an animal of 6.
The stout endopodites, on the other hand, probably performed the double function of natatory and ambulatory legs.
Billings recognized the remains of eight pairs of legs on the thorax, a pair for each segment, and he inferred from the fact that the appendages projected forward that they were ambulatory rather than natatory organs.
Preliminary notice of the discovery of the natatory and branchial appendages of trilobites.
Can the length of web that they dart forth counterpoise the weight of their bodies; or have they any organ analogous to the natatory vesicles of fishes[534], which contributes at their will to render them buoyant in the air?
The larvae of Dytisci, by means of these natatory organs, will swim, though slowly, and every now and then rise to the surface for the sake of respiration.
The first pair of natatory legs in Caradina, in its earliest condition within the egg, is uniramous, like the first pair in the larvae of Cirripedes.
As in the larvae of all ordinary Crustaceans, as yet known, the antennae are amongst the earliest developed organs; and as the first pair of natatory legs (Pl.
Lastly, behind the natatory legs, on the ventral surface, (Pl.
Its exact position likewise varies, for it arises either between the first or second pairs of natatory legs.
Scalpellum vulgare: the natatory legs are not drawn with accuracy, only the relative position of the several organs having been carefully attended to.
Their natatory respiratory abdominal laminae seem copied from the former, and their anal diverging setae from the latter[407].
In his Systeme, he supposes that the web-footed birds (Anseres) acquired their natatory feet by frequently separating their toes as far as possible from each other in their efforts to swim.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "natatory" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: aquatic; estuarine; littoral; seashore; shore; swimming; tidal
