MONOGRAPH OP THE GENUS PERIPATUS. 447 



papillae and the spinous pads. Each of these papillae is larger 

 than a normal papilla, and bears several spines (fig. 2). This 

 character of the papillae of this row is even more marked in 

 some of the anterior legs than in the one figured ; it seems 

 probable that the pads have been formed by the coalescence of 

 several rows of papillae 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 is 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 leg. 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 papillae, but spines and primary papillae 

 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 

 outer end of this is a primary papilla. At the distal end 

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

 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 



VOL. XXVIII, PART 4. NEW SER. H H 



