APPROXIMATE TO THE AMPHIPODA 391 



the uropoda ' present no greater resemblance to the Am- 

 phipoda than to several of the Isopoda such as AsellusJ 

 although the position alone would suffice to distinguish 

 them from those of Asellus, and if disjoined from the 

 animal there is absolutely nothing about them that would 

 enable any one to say that they belonged to any Crustacean 

 except their own or some Amphipod genus. The spine 

 at the lower end of the peduncle occurs as so often in the 

 Amphipoda. The genus and its two species are beyond 

 dispute remarkable, requiring to be placed in a separate 

 family, and though some may prefer to class this among 

 the Asellota, I have ventured to think that a separate tribe 

 Phreatoicidea should be instituted to receive it. 



