256 



RUCKER. 



[VOL. I. 



tion with this species. It is a bean-shaped papilla that is 

 always found in a depression on the dorsal surface of the leg 



where it joins the foot. Gaffron 

 describes this papilla in P. Edwardsii. 

 Seclgwick says it is also found in the 

 Trinidad species and is probably char- 

 acteristic of all the neotropical forms. 

 The surface of the depression in 

 which the papilla lies is smooth, while 

 the papilla itself shows a distinct cell 

 structure, the cells all converging 

 Fig. 6 represents a longitudinal section 



FIG. 6. 



toward the center. 



through the foot splitting the papilla. 1 



From the number of external outlets of glands connected 

 with the generative tract, it is readily seen that the male repro- 



FIG. 7 a. 



FIG. 7 b. 



1 It seems from the position of these papillae, especially when the foot is drawn 

 in, that they are sensory. If this be true, the comparison of the foot of Peripatus 

 Eiscnii with the parapodium of the Chaetopoda is rather striking, the sensory 

 papillae corresponding to the cirri. 



