38 



THREE CRUISES OF THE " BLAKE. 



characteristic of our littoral fauna, and are also found pelagic 

 in the gulf-weed, there are comparatively few deep-water species 

 and not so many novelties ; but there are new species of a group 

 of very small crabs, like Pilumnus, Neopanope, and Micropanope 



(Fig. 228), charac- 

 teristic of the West 



Indian fauna at 



moderate depths. 



Oft" the Atlantic 



coast of the United 



States, however, 



Ger yon quinque- 

 dens, previously known only from small specimens taken off 

 the northern coast of New England, was found growing to 

 enormous size at depths of from 200 to 800 fathoms, from 

 the south coast of New England to points far south of Cape 

 Hatteras. Specimens taken by the " Blake " show this species 

 to be one of the very largest of the Brachyura, the carapace 

 in some specimens being five inches long by six broad. Most 

 interesting among the Leucosoidea is Acanthocarpus bispino- 



sus. . (Fig. 229.) Here- 



Fig. 227. — Pisolambrus niti- 

 dus. f. (Milne-Edwards.) 



Fig. 228. — Micropanope 

 pugilator. -y 5 . 

 (Milne-Edwards.) 





Fig. 229. 



Acanthocarpus bispinosus. 

 (Milne-Edwards. ) 



tofore the only species of 

 the genus known was A. 

 Alexandria which is armed 

 with an enormous spine 

 N^ upon the outside edge of 

 the claw, instead of on 

 the side of the carapace. 

 The claws are provided 

 with a stridulating appa- 

 ratus, which is rubbed against the edge of the carapace. 



Quite striking is the large number of new forms of Dorip- 

 pidoidea, a group previously unknown from the Western Atlan- 

 tic and new to America. Cyclodorippe nitida (Fig. 230), a 

 small species with smoothly rounded (Fig. 231) and highly 

 polished carapace, will serve as an example. This and two 

 other species of the same genus were taken in 90 to 300 fath- 

 oms. Belonging to the same group is the remarkable and 



