Archive image from page 772 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRUSTACEA. 757 legumentary skeleton presents die ;t singular forms: thus among the Limmadia and tlie Cypris, the pieces which are analogous to the epimeral or lateral pieces of this cephalic buckler, acquire a great extension, whilst the tergal portion of the arc to which they belong continues rudimentary or proves entirely abor- tive, so that they constitute two large valves covering the whole body of the animal, and bearing considerable resemblance to
Archive image from page 772 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRUSTACEA. 757 legumentary skeleton presents die ;t singular forms: thus among the Limmadia and tlie Cypris, the pieces which are analogous to the epimeral or lateral pieces of this cephalic buckler, acquire a great extension, whilst the tergal portion of the arc to which they belong continues rudimentary or proves entirely abor- tive, so that they constitute two large valves covering the whole body of the animal, and bearing considerable resemblance to the shells of certain acephalous Mollusks. The dorsal laminae which in the Pandarus form appendices on the back similar to Elytra, and those which in the Anthostomata form a kind of sheath around the posterior part of the body, are also formed by the anomalous development of cer- tain parts of both the dorsal and ventral arcs of the two posterior thoracic rings. The inferior arcs of the thoracic rings of the tegumentary skeleton of the Decapoda, by their intimate union, form a kind of ventral shield, named sternal plastrum, upon which lines of conjunction indicate the respective limits of the greater number of the segments, as well as of the sternal and episternal pieces of which these are composed. In the Decapoda JVIacrour;) and Anomoura, this plastrum is in general very narrow, but in the Brachyura it is expanded to such a degree as frequently to con- stitute a great and nearly circular disc. In the whole of these Crustaceans, the lateral pieces of the thoracic rings are conjoined, like those of the inferior arc of the same segments, and form on either side of the middle portion of the body a septum which is covered by the cara- pace, and which is known among anatomists under the name of the vault of In the Macroura this septum is nearly vertical, but in the Brachyura it is oblique, or even almost horizontal. Fig. 383. Fig. 384. Lateral portion of the thorax
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