. A junior course of practical zoology. Zoology. EXTEENAL CHARACTEES 127 a. The tergam is the convex dorsal plate of the exoskeleton. b. The sternum is the ventral transverse bar between the bases of the limbs. c. The pleura are a pair of plates projecting down at the sides. d. The epimera are the portions of hardened cuticle between the pleura and the bases of the limbs. They are very small in this Fig. 32.—Astacns flnviatilis, var. nobilis. Transverse section through the abdomen, (c. h. h.) DA, dorsal abdominal artery. "EUL, extensor muscles of the abdomen. IBF, epimeron. FM,
. A junior course of practical zoology. Zoology. EXTEENAL CHARACTEES 127 a. The tergam is the convex dorsal plate of the exoskeleton. b. The sternum is the ventral transverse bar between the bases of the limbs. c. The pleura are a pair of plates projecting down at the sides. d. The epimera are the portions of hardened cuticle between the pleura and the bases of the limbs. They are very small in this Fig. 32.—Astacns flnviatilis, var. nobilis. Transverse section through the abdomen, (c. h. h.) DA, dorsal abdominal artery. "EUL, extensor muscles of the abdomen. IBF, epimeron. FM, flexor muscles of the abdomen. M, muscles of the appendage. U, endopodlte. TSGr, nerve-ganglion. P, protopodite : the proximal joint, which is very short, has been almost entirely cut away; its length is Indicated by the notch on the outer side of the protopodite. PL, pleuron. PR, proctodceum. S, sternum. T, tergum. V, ventral abdominal artery. X, exopodite. e. Soft uncalcified portions connect the segment with those in front of and behind it, and aUow move- ment of one segment upon another. f. The joints between the successive segments are provided with a rounded peg or pivot at each side on the anterior margin of the tergum, near its. 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 Marshall, A. Milnes (Arthur Milnes), 1852-1893; Hurst, C. Herbert (Charles Herbert), 1856?-1898, joint author. London, Smith, Elder
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1888
