ANATOMY AND DEVELOPMENT OP PERIPATUS CAPENSIS. 217 



they do not, however, become continuous with the ridges of the 

 other side, but passing between them gradually thin off and 

 vanish. 



The ridges on the legs are directed transversely to their 

 long axes, i.e. are at right angles to the ridges of the rest of the 

 body. 



The Antennae are ringed and taper slightly till near their 

 termination, where they present a slight enlargement in spirit 

 specimens, which in its turn tapers to its termination. 



The rings consist essentially of a number of coalesced primary 

 papillae, and are, therefore, beset by a number of spines like 

 those of the primary papillae (described below). They are 

 more deeply pigmented than the rest of the antenna. 



The free end of the antenna is covered by a cap of tissue like 

 that of the rings. It is followed by four or more rings placed 

 close together on the terminal enlargement. There appears to 

 be about thirty rings on the antenna3 of all adults of this 

 species. But they are difficult to count, and a number of 

 small rings occur between them, which are not included in the 

 thirty. 



The antennae are prolongations of the dorso-lateral parts of 

 the anterior end of the body. 



The Eyes are paired and are situated at the roots of the 

 antennae on the dorso-lateral parts of the head. Each is placed 

 on the side of a protuberance Avhich is continued as the an- 

 tenna, and presents the appearance of a small circular crystal- 

 line ball inserted on the skin in this region. 



The rings of papillae on that part of the head from which 

 the antennae arise lose their transverse arrangement. They 

 are arranged concentrically to the antennal rings^ and have a 

 straight course forwards between the antennae. 



The Oral Papillae are placed at the side of the head. They 

 are attached ventro-laterally on each side of the lips. The 

 duet of the slime gland opens through their free end. They 

 possess two main rings of projecting tissue, which are especially 

 pigmented on the dorsal side ; and their extremities are covered 

 by papillae irregularly arranged. 



