LEGS. 



555 



arranged as a saw-like row of denticles. The jaws appear to be 

 used for tearing the food, to which the mouth adheres by means 

 of the tumid suctorial lips. The oral papillae are placed at the 

 sides of the head (Fig. 333, or.p). The ducts of the slime-glands 

 open at their free end. They possess two main rings of pro- 

 jecting tissue, and their extremities bear papillae irregularly 

 arranged. 



The ambulatory appendages vary in number. There are 

 seventeen pairs in P. capensis and eighteen in P. Balfouri, while 

 in P. jamaicensis the number varies from twenty-nine to forty- 

 three pairs. They consist of two main divisions, which we may 



Fid. 336. Ventral view of last leg of a 

 male P. capensis (after Sedgwick). / 

 Foot ; I leg ; p spiniferous pads. The 

 white papilla on the proximal part of 

 this leg is characteristic of the male of 

 this species. 



FIG. 337.- Leg of _P. capensis seen from the front 

 (after Sedgwick). / foot ; I leg ; p spiniferous 

 pads. 



call the leg and the foot (Figs. 336 and 337). The leg (/) has 

 the form of a truncated cone, the broad end of which is attached to 

 the ventro-lateral wall of the body, of which it is a prolonga- 

 tion. It is marked by a number of rings of papillae placed 

 transversely to its long axis, the dorsal of which are pigment ed 

 like the dorsal surface of the body, and the ventral like the 

 ventral surface. At the narrow distal end of the leg there are, 

 on the ventral surface, three or four (rarely five, six, or seven) 

 spiniferous pads, each of which is continued dorsally into a 

 row of papillae. The foot (/) is attached to the distal end of the 

 leg. It is slightly narrower at its attached extremity than at its 

 free end. It bears two sickle-shaped claws and two, three or 



