156 BULLETIN OF THE 



sion indicating the outer extremity of the cervical sulcus, which is entirely- 

 obsolete in its median portion. The margin of the carapax is distinct and 

 somewhat acute on the hepatic region, and on the anterior part of the 

 branchial, as far as a slight angular projection, posterior to -which it 

 ceases to be defined. Surface of the carapax minutely granulated. Chel- 

 ipeds in the female two and a half times as long as the carapax, excluding 

 the spine, and minutely granulated ; meros more sharply granulated than 

 carpus and hand ; fingers very slender, much longer than the palm, and 

 armed within with needle-like teeth. Ambulatory feet very slender and 

 smooth, those of the first pair reaching to the middle of the palm of the 

 chelipeds ; meros-joint as long as the terminal three joints taken together. 



The above description is that of a female. In the male the carapax is 

 less smoothly rounded above, the regions being faintly indicated, and the 

 intestinal region protuberant above the base of the posterior spine. 



Dimensions of a sterile female : Length of carapax, including the poste- 

 rior spine, 0.63 ; breadth, 0.52; length of cheliped, 1.38 inch. 



Off Carysfort Reef, March 21, 1869. Cast No. 7. 40 fathoms. 

 Off French Reef, March 21, 1869. Cast No. 2. 45 " 

 Off Pacific Reef, May 13, 1869. Cast No. 3. 60 " 



Iliacantha sparsa nov. sp. 



Carapax oval ; intestinal and hepatic regions only defined ; surface 

 sparsely granulated; granules scattered, sharply projecting, almost like short 

 capitate spines ; surface between the granules punctate, or, as near the 

 margins, covered with smaller granules. Postero-lateral margin less con- 

 vex than in /. subglobosa. Postei-ior spines large ; lateral ones similar in 

 shape to and more than one half as large as the middle spine. A spine on 

 the hepatic region half as large as the lateral posterior ones. Depression 

 between the frontal and gastric region very deep, giving great prominence 

 to the facial projection ; median sinus of front very deep ; frontal teeth 

 much projecting. External maxillipeds larger, more produced in front, 

 and more coarsely granulated than in the preceding species; granules 

 prominent, like those of the back of the carapax. 



Dimensions of a sterile female : Length of carapax, posterior spine 

 included, 0.30; breadth, 0.25 inch. 



It is easily distinguished from /. subglobosa by its hepatic spine. 

 West of the Tortugas, January 16, 1869. Cast No. 1. 30 fathoms. 



Myropsis nov. gen. 

 This genus differs from Myra, to which it is nearly allied, in its more 

 globular form, in having five instead of three posterior spines, in the want 

 of the median and hepatic ridges, and in having the outer margin of the 



