29 



8446 



IT 



2075 



10 



Hooo'kong. 



" P. velutinus " Bate. E. Indian Archipelago. 



R. Hungerford. 

 "Challenger" (British Mns.) 



9, Mrtapeneus mogiensis, Rathbun. Plate Y., fig. 15. I5rt, b. 



Parapenseus mogiensis, llathbun, Proc. U.S. Nat. Mas. XXVI. 1903, p. 39. 

 Pensti-s velutinus (partim), Spi'nne Bate, loc. cit. 



It closely resembles M. stridulans, but differs from it in the absence of any 

 stridulating ridges on the carapace, and also in the following particulars : — 



The rostrum is shorter, in the male rarely surpassing the middle, in the 

 female rarely surpassing the far end, of the 2nd joint of the antennular 

 peduncle. 



The curved subhepatic groove (anterior part of cervical groove) definino- 

 the branchial region anteriorly, is more pronounced. The spine (branchioste- 

 gal) at the antero-inferior angle of the carapace is much weaker. The 6th 

 abdominal somite is only about half again as long as the 5th. 



In the female there is a pair of sternal teeth between the 3rd chelipeds, 

 and between the 2nd chelipeds a pair of teeth, not spines. 



The andricum is formed on the same plan as that of M. coniger and M. stri- 

 dulans, and though the outer lobule of the left lobe is a little the longer, that of 

 the right lobe is very much the larger: moreover, the outer lobule of the left lobe 

 ends in a slender filament the tip of which is frayed out or denticulate. 



The thelycum consists of the following parts : — (1) between the 5th pair of 

 legs two parallel transverse plates one behind the other ; the anterior is cut into 

 two laminfe, each of which may again be cut into two teeth ; the posterior is cut 

 into three lobes the outer of which are prominent and bluntly dentiform, while 

 the middle one often has a mucronate tip : (2) between the 4th pair of legs a 

 broad sunken plate with a pair of divergent median teeth near its posterior 

 border, the teeth standing in the interval between the two lobes of the anterior 

 of the two plates that lie between the 5th pair of legs. In the young female the 

 most conspicuous part of the thelycum is this last mentioned pair of teeth-. 



Large females may reach a length of 3^ inches. 



The species has been taken in abundance off the Malabar coast, in 28 fa- 

 thoms ; off Ceylon, in 28 and 84 fathoms ; and at various places in the Anda- 

 mans, up to 53 fathoms. 



There are 152 specimens in the collection, registered as follows : — 



f 8943 9026 9179 9964 ^ 

 6 " 6 ■ "1 



H 



9987 3311 3501 



6 



9 



10 



I- 



i 



J 



Andamans. 



" Investigator." 



