70 



Family Latreillid^, Alcock. 



Latreillidae, Alcook, Journ. Asiatic Soo. Bengal, LXVIII., pt. 2, 1899, p. 130. 



Carapace either elongate-quadrangular or piriform. Antennal flagella 

 shorter than the carapace. The slender basal joint of the eyestalk is very much 

 longer than the terminal joint. The external maxiUipeds are suboperculiform. 

 The gills are 8 on either side and there are no epipodites on the chelipeds or 

 ambulatory legs. 



The branchial formula is as follows : — 



Total 



1 + 3 ep. 



= 8 + .3 ep. 



Key to the genera of Latreillidge. 



I. Carapace subquadrilateral. Antennas long. All seven abdominal 

 segments distinct in both sexes 



II. Carapace piriform, its anterior poi-tion forming a long snbcylindrical 

 " neck." Anteunse short. The 4th, 5th and 6th abdominal seg- 

 ments of the female are fused together ... 



Latreillopsis, 



Latreillia. 



Latreillia, Roux. 



Latreillia, Rons, Crnst. Medit. pi. xxii. and text. Milne Edwards (79), DeHaan (23), Heller (40), Henderson (42), 

 A. Milne Edwards and Bonvier (76), Bouvier (12), Ortmann (84), Alcock (3). 



For referencea see J. A. S. B., LXVIII., pt. 2, 1899, p. 167. 



Carapace elongate-piriform, not covering the basal joints of the legs, its 

 anterior part prolonged to form a subcylindrical " neck " at the end of which 

 are the spiniform rostrum (lying deflexed between two long slender divergent 

 " supra-ocular " spines) the eyes, the antennules, and the antennse. The regions 

 are fairly well indicated, and there is no linea anomurica. 



The eyes are large, and the slender basal joint of the eyestalk is of extra- 

 ordinary length, being several times longer than the terminal joint. Antenna? 

 short, filiform. 



Epistome of great length fore and aft, corresponding with the " neck " of 



