A history of British star-fishes, and other animals of the class Echinodermata . 197. holothuriam:, OR CIRRHO-VERMIGRADE ECHINODERMATA. A Holothuria may be regarded in one light as a softSea-Urchin, in another as a radiated animal, approximatingthe The radiation of the surface is more orless complete in all the genera of Holothuriadse: the in-ternal organisation is mostly bilateral. The skin is usuallysoft and leathery; in a few genera strengthened by cal-careous or horny spines. Five avenues of suckers separatethe body into as many longitudinal segments, which in themajority are o
A history of British star-fishes, and other animals of the class Echinodermata . 197. holothuriam:, OR CIRRHO-VERMIGRADE ECHINODERMATA. A Holothuria may be regarded in one light as a softSea-Urchin, in another as a radiated animal, approximatingthe The radiation of the surface is more orless complete in all the genera of Holothuriadse: the in-ternal organisation is mostly bilateral. The skin is usuallysoft and leathery; in a few genera strengthened by cal-careous or horny spines. Five avenues of suckers separatethe body into as many longitudinal segments, which in themajority are of equal, or nearly equal dimensions. In somethe suckers are developed only on one side, so that theanimal, when creeping, presents in a manner a back and abelly. The suckers are similar to those of the true Star-fishes and Sea-Urchins. Besides progression by means of 198 HOLOTHURIADvR. these suckers, the Holothuriadce move as Annelides, by theextension and contraction of their bodies. They have amouth and an anus, each terminal, and placed at oppositeextremities of their bodies. T
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