71 



Bay of Bengal, 409 fathoms : Arabian Sea, in the vicinity of the Laccadives, 

 705 fathoms. 



Regd. Nos. -~ (Type of the species) : 628 ' 9 G ~ -. 



37. JPsathyrocaris itifirma, Wood-Mason MS. 



Psathyrocaris infirma, Alcock and Anderson, Journ. Asiatic Soo. Bengal, Vol. LXIII. pfc. 2, 1894, p. 159. 



ILLUSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE XII. FlG. 7. 



Differs from P. fragilis in the following particulars : — 



The rostrum, which otherwise is similar, is strongly humped dorsally, 

 instead of being flush with the gastric carina, and this carina is carried farther 

 backwards. 



The post-orbital ridge of the carapace is straighter and its branch that runs 

 towards the lower border of the carapace gives off a loop that rejoins the post- 

 orbital rido:e. 



The antennular scale does not reach to the end of the basal joint of the 

 antennular peduncle. 



The 1st pair of thoracic legs are not much longer than the carapace and 

 rostrum, and more than two-fifths of their length is contributed by the hand : 

 the carpus is an extremely short joint with its anterior border bulging strongly 

 beyond its articular facets : the fingers are less than half the length of the palm : 

 the exopodite is long. 



The 2nd pair of legs are about half the length of the body : the merus has 

 its posterior border serrated and has a strong spine at the distal end of its 

 anterior border : the carpus is a curious short ovoid joint, receiving the articula- 

 tion of the merus in the middle of its posterior border : the fingers are only half 

 the length of the palm, and their teeth are stronger than in P. fragilis. 



The 5th pair of legs, though otherwise similar, are longer than the carapace 

 and rostrum, and their exopodite is shorter than their endopodite. 



In the abdominal legs behind the first pair the endopodites are about a 

 sixth the length of the exopodites. In the first pair the exopodites are as lono- 

 as the carapace (and rostrum) and first abdominal somite. 



Colour in life, crimson. 



Andaman Sea, 405 fathoms. 



Regd. No. — (Type of the species). 



