ANATOMY AND DEVELOPMENT OF PEKIPATUS CAPENSIS. 219 



several rows of papillse on the ventral surface of the legs. On 

 the outer and inner sides of these pads the spines are absent, 

 and secondary papillae only are present. 



In the centre of the basal part of the ventral surface of the foot 

 there are present a group of larger papillae, which are of a slightly 

 paler colour than the others. They are arranged so as to form 

 a groove, directed transversely to the long axis of the body, and 

 separated at its internal extremity by a median papilla from a 

 deep pit which is placed at the point of junction of the body and 

 leg. The whole structure has the appearance, when viewed 

 with the naked eye, of a transverse slit placed at the base of 

 the leg. The segmental organs open by the deep pit placed 

 at the internal end of this structure. The exact arrangement 

 of the papillae round the outer part of the slit does not appear 

 to be constant. 



The foot is attached to the distal end of the lesf. It is 

 slightly narrower at its attached extremity than at its free end, 

 which bears the two claws. The integument of the foot is 

 covered with secondary'papillse, but spines and primary papillse 

 are absent, except at the points now to be described. 



On each side of the middle ventral line of the proximal 

 end of the foot is placed an elliptical elevation of the integu- 

 ment covered with spines. Attached to the proximal and 

 lateral end of this is a primary papillae. At the distal end 

 of the ventral side of the foot on each side of the middle 

 line is a group of inconspicuous pale elevations, bearing 

 spines. 



On the front side of the distal end of the foot, close to the 

 socket in which the claws are placed, are two primary papillae, 

 one dorsal and the other ventral. 



On the posterior side of the foot the dorsal of these only 

 is present. The claws are sickle-shaped, and placed on papillae 

 on the terminal portion of the foot. The part of the foot on 

 which they are placed is especially retractile, and is generally 

 found more or less telescoped into the proximal part (as in the 

 figure). 



The fourth and fifth pairs of legs exactly resemble 



