263 



The rostrum, which is about one-third the length of the carapace, is brou'lly 

 lamellar and trifid, is finely serrated at the sides, and is traversed by a finely 

 serrated carina that extends uninterruptedly to the cervical groove. 



The carapace is markedly convex and semi-elliptical : the frontal margin 

 is strongly convex and is armed with two spines, one above the base of the 

 antenna on each side : the lateral margins are multiserrate : the posterior margin 

 is raised, and like the rest of the carapace, is sharply and evenly granular : all 

 the regions of the carapace are well delimited. 



The abdominal terga are smooth, the telson alone, like the outer halves of 

 the caudal swimmerets, being finely granular. 



The eyes are movable, and the eyestalks are not prolonged beyond their 

 cornea : there is a considerable interval between them and the antenna, but no 

 spine. 



The antennal peduncles are remarkably slender, and are not longer than 

 the eyes (which are not half the length of the rostrum) : the flagella appear to 

 have been not longer than the carapace. The external maxillipeds are small 

 and slender : the meropodite has two large unciform spines (the proximal one 

 slightly bicuspid) on the inner edge near the base, and a large terminal spine on 

 the outer edge. 



The chelipeds are remarkably long and slender, being, even in the female 

 nearly twice the length of the fully extended body : they are closely thorny, on 

 every surface, up to the base of the fingers : the palm is more than three times 

 the length of the fingers. The longest of the second to fourth thoracic legs is 

 not much more than half the length of the chelipeds : all are densely spiny up 

 to the remarkably short dactyli, which are hardly one-fourth the length of the 

 propodites : a spine at the distal end of the meropodite is pre-eminent in all. 



Length of fully extended body 54 millim., of chelipeds 100 millim. Colours 

 in life, pale salmon. 



Arabian Sea, north of the Laccadives, 636 fathoms. 

 Regd. No. -jp (Type of the species). 



33. Mtinidopsls (Galttthodes) posidotila, Alcock & Anderson. 



Munidopsis potidonia, Alcock and Anderson, Joarn. Asiatic Soc. Bengal,^LXUI.~pt. 2, 1894, p. 167. 

 ILLUSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACKA, PLATE XII. Fn;. :!. 



The dorsal integument of body and appendages is finely scabrous beneath tht 

 usual pubescence. 



The rostrum, which is about one-third the length of the carapace proper, 

 is vertically compressed, carinated, and trifid at tip. 



