26 



at their distal extremity, the chelae, finally, are 20,5 mm. long. In the female of Hemip. 

 crassipes, on the contrary, the merus is 16,5 mm. long and 3 mm. wide, the carpus 19,5 mm. 

 long and 2 mm. thick at the distal extremity, while the chelae are 22 mm. long. 



The 4'^^ legs project with their dactyli beyond the antennal scales and with one-third of 

 these joints beyond the legs of the 3"^ pair ; those of the 5'*^ have lost propodus and dactylus ; 

 but the carpi reach almost to the extremity of 2°'^ antennular article. The 4'*^ and the 5''> legs 

 are somewhat less slender than those of Hemip. crassipes, as in shown by the following 

 Table, while the carpi and propodi are also a little shorter with regard to the meri. 



Length of the merus 



Width ^) of the merus 



Proportion between length and width of the merus . 



Length of the carpus 



Width of the carpus 



Proportion between length and width of the carpus . 



Length of the propodus 



Width of the propodus 



Proportion between length and width of the propodus . 

 Length of the dactylus 



Length of the merus 



Width of the merus 



Proportion between length and width of the merus . 



Length of the carpus 



Width of the carpus 



Proportion between length and width of the carpus . 



Length of the propodus 



Width of the propodus 



Proportion between length and width of the propodus . 



In the female of Hemip. crassipes the legs are smooth and glabrous, in Hemip. Sibogae^ 

 on the contrary, thickly covered with microscopical spinules. 



Thelycum as in Hemip. crassipes, and, as regards the branchial formula, both species 

 also seem to agree. Length of body from the tip of the ro.strum to that of the telson 136 mm. 



Remarks. Hemip. gracilis Sp. Bate from the Philippines may be identical with this 

 species or with Hemip. crassipes. Dr. Calman, of the British Museum, who kindly examined 

 for me the si.x type specimens, wrote me the following : 



"I find that there are six specimens of Hemip. gracilis from the same locality in the 

 "Challenger" Collection. The most perfect of these has a total length of about 48 mm. (the tip 

 of the telson is broken) ; it has the third abdominal somite rounded, not carinate. The length 

 of the sixth abdominal somite along the upper edge is 7,2 mm., its width, in the middle of the 

 somite, is 3,9 mm. and it is 1,5 mm. thick. The length of the fifth somite is 3,25 mm. 



l) Measured in the middle of the joint. 



