Text-book of comparative anatomy . ormed limbs. These extremitiesare placed laterally at that part where the arched dorsal side bendsin to meet the flat ventral side. Each extremity is truncated, 428 COMPARA TIVE AX A TOM Y CHAP. with transverse rows of papillae, which give it a ringed appearance,and each falls into two parts, a larger proximal conical leg and asmaller, narrower, distal foot, ending in two chitinous claws. Integument.—The body epithelium (hypodermis) is externallycovered by a delicate chitinous cuticle. The spines on the papilla? andclaws on the feet also belong to the cuticul
Text-book of comparative anatomy . ormed limbs. These extremitiesare placed laterally at that part where the arched dorsal side bendsin to meet the flat ventral side. Each extremity is truncated, 428 COMPARA TIVE AX A TOM Y CHAP. with transverse rows of papillae, which give it a ringed appearance,and each falls into two parts, a larger proximal conical leg and asmaller, narrower, distal foot, ending in two chitinous claws. Integument.—The body epithelium (hypodermis) is externallycovered by a delicate chitinous cuticle. The spines on the papilla? andclaws on the feet also belong to the cuticular formation secreted by thehypodermis. Under the hypodermis lies a peculiar subepithelial layer,formed of fibres running in various directions. Musculature (Fig. 291).—Pcripatm has a strongly developed dermo-muscular tube, which consists of the following layers : (1) an externallayer of circular muscular fibres ; (2) a double layer of fibres crossingeach other diagonally; (3) internally a strong longitudinal layer, con- e» m. FK;. 2C1.—Transverse section through the antepenultimate segment of a female Peri-patus Edwardsii (after Gaffron). n, Longitudinal trunks of the nervous system; h, heart (con-tractile dorsal vessel); hn, longitudinal muscles; lit, uterus; d, intestine; OH, outer apertures ofthe nephridia. sisting of various bundles, whose arrangement on a transverse sectionof the body is shown in Fig. 291. In addition to these layers thereare numerous sagittal or transverse muscle fibres corresponding withthe dorso-ventral or transverse muscle fibres of the Anmdata. Someof these fibres run through the body cavity in such a way as to divideit into a median and two lateral divisions, the former containing theheart, the intestine, and the sexual organs, the latter the longitudinaltrunks of the nervous system and the segmental organs. The muscul-ature of the extremities chiefly proceeds from the layer of diagonalfibres and the sagittal musculature. Special muscles serv
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
