PERIPATUS GDIANENSIS. 153 



and fifth pairs of legs, on which they are placed between the 

 third and fourth spinous pads on the top of a papilla (PI. 14, 

 fig. 5). In the male, sexual papilla3 are found on the anti- 

 penultimate pair of legs (PI. 14, fig. 6). 



The feet present the same general appearance as in the 

 majority of American species. There are two primary 

 papillte in front of the distal end of the foot and one behind. 

 On the ventral aspect of the foot there are two pairs of 

 elevations, on every one of which there are three spines, 

 twelve in all, which is the maximum, but not the minimum 

 number of spines observed on any foot. In the cases in 

 which there were fewer spines than twelve some of them had 

 probably been lost. 



The number of appendages present in several embryos, in 

 which all the legs had already appeared, have been counted, 

 and have been found to vary from twenty-four to twenty- 

 eight pairs, numbers which represent the extremes found in 

 the adults. It seems highly probable that specimens with 

 fewer than twenty-four or with more than twenty-eight pairs 

 will prove to be rare exceptions in Peripatus guian- 

 ensis. 



Internal Characters. 



As far as I have been able to make out from dissection, 

 the internal anatomy agrees with that of the most typical of 

 the neotropical species, and there is no need but to point out 

 that certain organs of importance do exist. The alimentary 

 tract is quite normal, and is surrounded by the numerous 

 branches of the slime glands, which extend almost to the 

 posterior end of the animal. The organs which demand 

 special notice are those which constitute the male and female 

 generative systems. 



The Male Generative System. — The male generative 

 organs are quite typical of those of the South American 

 Peripatidse (PI. 14, fig. 9). The testes are tubular in form, 

 and are freely suspended in the body-cavity. Each testis 



