152 BULLETIN OF THE 



with a small spine at the inner angle ; hand compressed, smooth. Ambu- 

 latory feet pubescent, the dactyli in particular being covered with short 

 hairs on all sides. 



Dimensions of a male: Length of carapax, 0.28; greatest breadth, at 

 tips of the fourth antero-lateral teeth, 0.43 inch ; proportion, 1 : 1.54 ; length 

 of ambulatory feet of the second pair, 0.60 inch. 



Dredged between East and Middle Keys, Tortugas, in from 5 to 7 

 fathoms. 



LEUCOSOIDEA. 



Family CALAPPIDAE. 



Subfamily CALAPPINAE. 



Cyclois Balguerii Stm. 



Mursia Balguerii Desbonne et Schramm, Crust, de la Guadeloupe, p. 52, pi. iv, 

 fig. 20. 



The specimens agree in all respects with the description and figure 

 quoted, except in the proportions of the carapax, which is narrower than in 

 the Guadaloupe specimens, being fully as long as broad. 



Key West, 2 to 5 fathoms. 



Between East and Middle Keys, Tortugas, 5 to 7 fathoms. 



Off Orange Key, Bahamas, April 1, 1869. Cast No. 2. 9 fathoms. 



Off the Tortugas, March 4, 18G8. Cast No. - 13 " 



Off Pacific Reef, May 13, 1809. Cast No. 1. 30 «' 



Off Carysfort Reef, March 21, 1869. Cast No. 8. 35 " 



Off Cansfort Reef, March 21, 1869. Cast No. 7. 40 



Off French Reef, March 21, 1809. Cast No. 2. 45 " 



Acanthocarpus nov. gen. 

 Body regularly ovate, strongly convex in its antero-posterior dorsal out- 

 line. Carapax as broad as long, broadest in front. Antero-lateral con- 

 tinuous with the. postero-lateral margin ; the latter armed with a strong 

 tooth at about the middle. Fronto-orbital region very broad, occupying 

 more than half the width of the carapax. Eyes large. External maxilli- 

 peds not reaching to the anterior extremity of the buccal area ; ischium 

 truncate in front, without projecting at the inner angle, which, like the 

 outer one, is a right angle ; meros shorter and broader than the ischium, 

 and narrowed in front, with the palpus attached at the antero-interior 

 angle ; exognath reaching to the tip of the meros. Chelipeds with a great 

 spine on the carpus placed in a horizontal plane and pointing outward in a 

 direction exactly transverse to the axis of the body. The ambulatory 

 feet all have slender dactyli, as in Calappa and Mursia. 



