STALK-EYED CRUSTACEA 367 



antennae ; cornea very small, and occupying only about a 

 sixth of the length of the terminal joint of the peduncle. 

 The carapace has tufts of hair. First pair of legs very 

 large, that of the right slightly the largest, both armed 

 above with a row of strong spines, and covered in the 

 rest of their extent with tubercles, of which the base is 

 surrounded in front with a row of short hairs which describe 

 a semicircle, and in their arrangement resembling scales. 

 The next two pairs of legs are large, almost cylindrical, 

 and covered with hairy ridges arranged somewhat like those 

 of the first pair. The pincers of the last two pairs of legs 

 are well-formed. 



Range. — West Indian Sea. 



4. Pylopagurus. 



Pylopagiirus A. Milne Edwards and 



Bouvier. 



The right pincer is well developed, and forms an 

 operculum, filling more or less exactly, as a door, the 

 chamber in which the animal lives. This pincer is folded 

 at a right angle upon the forearm ; and cannot be com- 

 pletely extended. Its external face is more or less oval, 

 the internal regularly convex. The left pincer is much 

 swollen, and can also be placed at a right angle with its 

 forearm. The fingers are wide, compressed, and move in 

 a horizontal plane ; those of the left hand have horny 

 tips. The front has three projections, obtuse, but usually 

 little developed. The internal antenna are of moderate 

 length, and the eye-stalks are wider at their extremity 

 than at the base ; the basal scales are wide apart. The 

 walking legs are laterally compressed, and never exceed 

 the large hand. The penultimate pair are subchelate, and 

 the last pair chelate. Abdomen well developed ; no pro- 

 truded vas deferens. * 



