NOTES ON THE PERIPATUS OF DOMINICA. 291 



iii. The division of the primary papillae into two portions. 



iv. The absence of the dorsal white line. 



V. The arrangement of the teeth on the inner blade of the 

 jaw, there being a considerable gap between the first minor 

 tooth and the rest. 



vi. The presence of the receptacula ovorum and seminis on 

 the oviducts. 



vii. The unpaired portion of the vas deferens is of great 

 length and much coiled. 



viii. The number of legs is not constant. 



Compared with P. Edwardsii, to which the Dominican 

 species is most nearly allied, we find the following special 

 points of agreement : 



i. There are two foot-pads only on the legs of the last pair. 



ii. The male has a smaller number of legs than the female. 



iii. The basal part of the primary papillae is cylindrical in 

 both. 



iv. The jaws and arrangement of the teeth are similar in 

 the two. 



v. There is in each a pair of accessory glands opening on 

 each side of the anus. 



The chief differences between the two are — 



i. The number of ambulatory appendages ; of these 

 there are 29 to 34 pairs in P. Edwardsii, and 25 to 30 in 

 P. Dominicse. 



ii. The white tubercles which are present on some of the 

 legs in P. Edwardsii are not found in the species now 

 described. 



Compared with P. Trinidadensis. — The Dominican species 

 differs much more from P. Trinidadensis. Besides the 

 difference in the number of ambulatory appendages (P. 

 Trinidadensis having 28 — 31 pairs), the two forms differ in 

 the number of teeth on the inner blade of the jaw, the 

 Trinidad species having a much larger number than the 

 Dominican. Moreover in the Trinidad Peripatus the basal 

 portion of the primary papillae is conical, whilst in the 

 Dominican form it is cylindrical. 



