Indian Deep-sea Dredging. 271 



Order DECAPOD A. 



Suborder NATANTIA. 



PEN^IDEA. 



Family PenaBidse. 



Subfamily Pen^ina. 



No representatives of this group have as yet been found 

 amongst either the infra-littoral or the bathybial fauna. 



Subfamily Parapen^ina. 



Ohs. Spence Bate's Artemisia longinaris belongs here ; it 

 is not in the remotest degree related to the Aristajina. 



Metapen^:us, gen. no v. 



Allied to Parapenceas, S. I. Smith, diflfering therefrom in 

 having neither tergo-pleural nor cephalothoracico-pleural 

 suture to its carapace, and in the branchial system, which is 

 invariably furnished with an epipodite in the twelfth somite 

 and with a filamentous vestige of an anterior arthrobranchia 

 in the thirteenth. 



Type Penceus affinis, H. Milne-Edw. 



The first two of the three following species are referred 

 with some confidence to this genus as little-modified deep-sea 

 representatives of it, the third with some doubt, as it lacks 

 the branchial rudiment. 



5. [Metapenceus philippinensis, var. andamanensis, nov. 



Penceus philippinensis, Sp. Bate, ' Challenger ' Macrura, 1888, p. 2G1, 

 pi. XXXV. figs. 2, 5, 3, J. 



Differs from the specimens described and figured by Spence 

 Bate in its much smaller size and in the median part of the 

 annulus ventralis being shorter and devoid of lateral notches. 

 The rostrum is in both sexes almost straight and scarcely 

 ascendant ; in the largest female it extends somewhat beyond, 

 in the other females and in a male barely to, the end of the 

 penultimate joint of the antennulary peduncle. The legs of 

 the first pair are furnished with a spine at the ventral apex 

 of their second and third joints. In the female there is a 

 pair of sternal spines between the second pair of legs similar 

 to, but very much smaller than, those present in M. velutinus 



