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A tribe of ungulates comprising the camels.

rent in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda.

Of or pertaining to a uropod.

osterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.

alled because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.

The division of Cephalopoda in which the arms are furnished with cup-shaped suckers, as the cuttlefishes, squids, and octopus; the Dibranchiata. See Cephalopoda.

Not possessing a mantle; -- said of certain gastropods.

The Carob, a leguminous tree of the Mediterranean region; also, its edible beans or pods, called St. John's bread.

A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal.…

An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.

A rhizopod. common in fresh water, capable of undergoing many changes of form at will. See Rhizopoda.

That division of the Rhizopoda which includes the amoeba and similar forms.

One of a pair of shelly plates found in some cephalopods, as the ammonites.

Producing one seed only in a seed pod.

Having seeds inclosed in a pod or other pericarp.

With a narrow mouth, as the shell of certain gastropods.

A primary division of gastropods, including those having spiral shells. The two sides of the body are unequally developed.

gs or annular segments, and without jointed legs. The principal subdivisions are the Chætopoda, including the Oligochæta or earthworms and Polychæta or marine worms; and the Hirudinea or leeches. See Chætopoda.

division of the Invertebrata, nearly equivalent to the Articulata. It includes the Arthoropoda and Anarthropoda. By some zoölogists it is applied to the former only.

A group of decapod Crustacea, of which the hermit crab in an example.