. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 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. Thorax of an Atelecyc
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 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. Thorax of an Atelecyclus seen from below, a, sternal pieces of the second thoracic ring ; b, episternal piece of the corresponding ring ; c, epi- meral pieces; d, apodemata, which run from the sternum to the epimera, and separate the inser- tions of the extremities ; e, antipenultimate ring of the thorax presenting the orifices of the female reproductive organs. It frequently happens that the tegumentary membrane is folded so as to penetrate more or less deeply the interior of the ring among the different organs which fill the cavity. These folds, which may become solid lamina; by being impregnated with calcareous salts, have received the name of apodemata, and always proceed from the lines of conjunction of the different pieces, or of the different rings with one another. We shall have occasion to revert to this part of our subject very shortly. 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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