608 



ZOOLOGY 



lip of a number of short rings bearing minute spines. The ej'es 

 are constructed somewhat after the model of the cha^topod eye as 



described on 

 situated the 



p. 478. On 

 apertures of 



the surface of the oral papillse are 

 pair of glands — the sHwe glands. 

 Each jcnu is composed of two 

 curved, falciform, pointed, 

 chitinous plates, the inner 

 toothed on their posterior con- 

 cave edge ; they lie at the sides 

 of the mouth enclosed by a cir- 

 cular lip. The jaws, as well 

 as the oral papillas, are de- 

 veloped as modified limbs. 



The legs are not jointed, but 

 rows of papillos give them a 

 ringed appearance ; each con- 

 sists of a conical proximal part 

 and a small distal part or foot, 

 the latter terminating in a 

 pair of horny claws. 



The ventral surface is reddish 

 in colour, the dorsal darker : 

 the latter presents an elaborate 

 pattern — which varies greatly 

 in different individuals — pro- 

 duced by minute mottlings of 

 various colours and tints — 

 green, red, and brown, and the 

 arrangement of these in stripes 

 and bands. 



Body - wall and body - 

 cavity. — The wall of the body 

 consists of a cuticle, a layer of 

 deric epithelium with an un- 

 derlying layer of fine fibres, a 

 layer of circularly arranged 

 muscular fibres, and a layer of 

 longitudinal fibres divided into 

 a series of bundles. A layer of 

 epithelium lines the wall of the 

 body-cavity and invests the 

 contained organs. Incomplete muscular partitions divide the cavity 

 into a median and two lateral compartments, in addition to the 

 pericardium, or space in which the heart is lodged ; the lateral com- 

 partments send prolongations into the legs. As in the Arthropoda 

 in general, the body- cavity is a hasmocoele, and is filled with blood. 

 The enteric canal (Fig. 481) begins with a small buccal cavity, 



Fin. 4S1. — Dorsal view of thtj internal organs of 

 Peripatus, an. anus ; ant. antennae ; h/n. 

 hraln ; fox: r/ld. coxal gland of the seven- 

 teenth leg : ^ pen. male genital aperture ; 

 ne. CO. nerve-cord ; nepJi. nophridia ; oy. pap. 

 oral papilli© ; phar. pharynx ; s"/. gtd. salivary 

 gland ; s/. pid. sliiue-gland ; stoin. storaach. 

 (Combined from Balfour.) 



