1899.] A. Alcock — Garcinological Fauna of India. 165 



preceding joint — has a close comb of articulating spines along its 

 posterior border. 



The fourth (dorsal) pair, which are extremely slender, have the 

 posterior border of the merus strongly spinate : the propodite is several 

 times longer than the minute dactylus. 



The terminal joint of the male abdomen ends acutely. 



Hairs and bristles are sparsely present just as in the preceding 

 species. 



The carapace of a large egg-laden female is 38 millim. long and 

 30 millim. broad. 



In the Indian Museum are eleven specimens, representing adults and 

 young of both sexes, dredged off the coast of Travancore at 430 fathoms, 

 on a bottom which, though muddy, was abundantly covered with coral. 



Family II. LATREILLIDiE. 



Keij to the genera of the Family Latreillid^. 



I. Carapace subqnadrilateral. Antennas long. All seven 



abdominal segments distinct in both sexes ... ... Latreillopsis. 



II. Carapace piriform, its anterior portion forming a long 

 subcylindrical " neck." Antennae short. The 4th, 5th, 

 and 6th abdominal segments of the female are fused 

 together ... ... ... ... ... Latreillia. 



Latreillopsis, Henderson. 



Latreillopsis, Henderson, Challenger Anomura, p. 21 : Ortmann in Bronn's 

 ■Thier-Reich, v. ii. Arthropoda, p. 1156. 



Carapace subquadrilateral, deepish, with vertical side-walls, not 

 entirely concealing the basal joints of the legs : the regions fairly well 

 indicated. Front of moderate width, ending in a spiniform rostrum on 

 either side of which is a long slender divergent "supra-ocular" spine. 

 Linea anomurica present, most distinct posteriorly. 



Eyes as in Latreillia, large and borne free at the end of slender 

 eyestalks of remarkable length. Antennae long, freely movable from 

 their base ; the peduncle slender, cylindrical, and consisting of four 

 joints, as usual. 



Epistome well demarcated from the palate. Buccal cavern much 

 broader in front than behind, the efferent branchial channels very well 

 defined. Though the external maxillipeds do not quite meet across 

 the buccal cavern they are distinctly operculiform, owing to the expan- 

 sion of their merus. 



Chelipeds long and slender but much shorter than the first three 

 pair of legs : their joints, like those of the legs, are cylindrical, and 

 the palm in the male is enlarged and club-sliaped. 



