. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Lateral portion of the thorax of a Decapod. a, the epimeral pieces united to form the vault of the flancs ; l>, the sternum ; c, the apodemata rising from the sternum and separating the in- sertions of the legs. It is among those Crustaceans the thoracic rings of whose tegumentary skeleton blend or become consolidated in this manner, and ac- quire dimensions so considerable, that the struc- ture of this portion of the frame-work also exhi- bits the utmost extent of complication, in con- sequence of the existence of la
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Lateral portion of the thorax of a Decapod. a, the epimeral pieces united to form the vault of the flancs ; l>, the sternum ; c, the apodemata rising from the sternum and separating the in- sertions of the legs. It is among those Crustaceans the thoracic rings of whose tegumentary skeleton blend or become consolidated in this manner, and ac- quire dimensions so considerable, that the struc- ture of this portion of the frame-work also exhi- bits the utmost extent of complication, in con- sequence of the existence of large apodemata in their interior. These septa are of two kinds ; the one, styled sternal apodemata, arise from the lines of consolidation of the thoracic sternal pieces; the other, named epimeral apodemata,. Vertical section of a portion of the thorax of one of the Brachyura. a, sternum, with a sternal apodema rising from it; l>, epimera from the inner surface of which an epimeral apodema descends to join the sternal apodema, and thus form a septum between the thoracic cells. arise in a similar manner from the epimeral pieces of the same rings. They are met with among the Macroura and Anomoura, as well as among the Brachyura; but it is among these last that they acquire their highest development; their direction, vertical to the internal planes of the rings, and the unions of those that rise from the inferior aspect or floor with those that des- cend from the arched superior surface, give rise to the most singular combinations and forms, too multifarious to admit of description in an article of the extent of that in which we are engaged, but the final effect of which is the establishment of cells, divided from one an- other by vertical septa, and corresponding to each ring, and further intersected in the direc- tion of their height, in a certain number of species, and divided into two stages by means of horizontal reduplications. It is within these different cells that the m
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