THE TAIL UNIQUE OO7 
Acanthocdpe, Beddard, 1885, has the side-plates of the 
perzeon, except the first pair, furnished with long spine- 
like processes, and the pleon ending in an elongate spine- 
like process. The mandibles have a powerful molar and a 
small, three-jointed ‘palp.’ The hind limbs of the perzeon 
have a natatory character. The uropods are simple, long, 
and stiliform, from three- to five-jointed. In Acanthocope 
spinicauda, taken from a depth of 1,800 fathoms in the 
Southern Ocean, the five-jointed uropods present a feature 
unique inthis tribe. <Acanthocope acutispina, from South 
America, has three-jointed uropods, and the first antennee 
with a short flagellum instead of a very long one as in the 
companion species. 
