72 Bulletin, Vanderhilt Marine Museum, Vol. II 



Brazil at Rio de Janeiro. The ^'Ara" specimen from 50 fms. estab- 

 lishes the maximum depth from which this species is known, 30 fms. 

 having been hitherto the greatest depth from which it has been re- 

 corded. 



Material examined : One male dredged in 15 fms. of water, Bury 

 Island Flats, Bahamas, January 22, 1925; one male from off Knight's 

 Key, Florida, March 29, 1926; one large female dredged in 50 fms., 

 American Shoal, Florida. 



Technical description: Crab small, body triangulate, rostrum 

 produced into a rounded hood which is hollow beneath and carinated 

 on the median dorsal line; superior orbital margin elevated; hepatic 

 region tumid, produced into an acuminate, downward-pointing tooth ; 

 pterygostomian region protuberant with a median tubercle; gastric 

 region separated from the hepatic, elevated, with two median tubercles 

 in the male, one in the female ; one large, conical tubercle on the cardiac 

 region ; the first, second, third and fourth abdominal segments are pro- 

 duced in the center forming a posteriorly directed node ; the fifth, sixth 

 and seventh segments in the female are completely fused, forming a 

 wide, heart-shaped brood pouch which is produced into convex lobes 

 on each side of the vaulted median ridge. The male belt is narrow, 

 segmented. The postlateral angle of the carapace is far back, above 

 the base of the first ambulatories, and is obtuse ; the branchial regions 

 are low in comparison to the gastric and cardiac regions. There are 

 a number of clusters of hook-like setae on the upper surface of the 

 carapace, one of the most prominent being a subscrescentic arrange- 

 ment of setae at the base of the rostrum. The legs are also furnished 

 with these hooked setae and with long, stiff, straight setae whose 

 length is approximately three to four times the width of the support- 

 ing leg. 



The eyestalk is protruberant, slightly constricted medially, with a 

 tongue-like projection on the upper surface of the cornea, which latter 

 is terminal, hemispherical. 



The antennulae are long and fold vertically within the septa be- 

 neath the rostral hood. 



The antennae have the basal article narrowed anteriorly and are 

 longitudinally bicarinate and channelled; the free articles are elon- 

 gated, slender, cylindrical ; the flagellum is very fine, multiarticulate, 

 setose, not as long as the two free articles of the peduncle. 



The external maxilliped has the ischium produced to a decided lobe 



