190 



The 2nd legs resemble the 1st in form, but are smooth and slender. In the 

 last 3 pairs of legs the end of the propodite, near the articulation of the dactylus, 

 is setose. 



In our largest specimen the length of the carapace, measured in the 

 middle line and including the rostrum, is 11'5 millim., that of the abdomen 20'5 

 millim. 



Arabian Sea, 636 fathoms : Bay of Bengal, off Ceylon, 800-637 fathoms. 



Ti -, XT 9314 769 



Regd. Nos. -9-: 15. 



no. Calocaris alcocki, McArdle. 



Calocaris alcocki, McArdle, Ann. Mag. Nat. Hist., Nov. 1900, p. 476. 



ILLUSTRATIONS OF THB ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE L. FIG. 4. 



This species can be distinguished from C. macandrese by the following 

 differences : 



The integument is polished. The carapace (rostrum included), measured 

 in the middle line, is a little longer than the first 5 abdominal somites and is 

 bluntly carinated in the middle line : the branchial grooves are as distinct as the 

 cervical groove. 



The rostrum, which reaches to the end of the antennular peduncle, is 

 upcurved and dorsally grooved ; on either lateral border, near the middle, are 1 

 or 2 spines, and on each of the epigastric continuations of the lateral borders is 

 a single spine. 



The eyes which are large and subsessile are obliquely flattened. 



The " scaphocerite " of the antennal peduncle is as small as it is in 

 C. macandrese, not overlapping the base of the penultimate joint, but the 

 " stylocerite " is longer and does overlap the base of that joint : the penultimate 

 joint of the peduncle is more than three times as long as the 2nd joint. 



The merus of the external maxillipeds has a subterminal spine on its inner 

 border. 



In the female the large chelipeds are as long as the body without the telson, 

 and the hand is as long as the combined carpus and ischium : the carpus is 

 two-thirds the length of the palm, and the palm is as long as the fingers : there 

 is a terminal spine on the lower border of the ischium and on the upper border 

 of the merus and palm : the cutting edge of the fixed finger is finely crenulate 

 at its proximal end, and the dactylus has an enlarged tooth near its base. 



In the female the protopodite and endopodite of the 2nd pair of abdominal 

 appendages are long and rigid, and articulated to the tip of the endopodite is a 

 large boot-shaped plate, its toe pointing backwards and its heel armed with a 

 spine. 



