. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Theoretical figure illustrating the composition of the tegumentary skeleton of Crustacea. 1), Dorsal arc ; t, t, tergal pieces ; e, e, epimeral pieces ; V, ventral arc ; s, *, sternal and episternal pieces ; P, insertion of the extremities. dian line constitute the tergum (jig- 378, D) ; the superior arc is completed on either side by two other pieces, known under the name oifiancs or epimeral pieces (Jig. 378, e). The inferior arc presents in its composition an exact counter- part of the superior. Two of the four pieces
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Theoretical figure illustrating the composition of the tegumentary skeleton of Crustacea. 1), Dorsal arc ; t, t, tergal pieces ; e, e, epimeral pieces ; V, ventral arc ; s, *, sternal and episternal pieces ; P, insertion of the extremities. dian line constitute the tergum (jig- 378, D) ; the superior arc is completed on either side by two other pieces, known under the name oifiancs or epimeral pieces (Jig. 378, e). The inferior arc presents in its composition an exact counter- part of the superior. Two of the four pieces into which it may be resolved constitute the sternum, situated in the median line, and are flanked by the two episternums. The two arcs thus composed, instead of cohering by their edges, leave a space for the insertion of the lateral appendages or extremities which corre- Fig. Anterior portion of the body of an Amphipoda. t, tergum of the fourth thoracic ring ; e, epimera of the same ring. spond with them. It is true, indeed, that we have no instance of any single ring which exhi- bits the whole of these pieces distinct from one another; in general several are anchylosed so * Aunalcs dcs Sc. Nat. torn. i. as to appear but one; yet the comparative study of the apparatus in the different members of the class at large, leaves no doubt of their existence severally. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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