PENEOPSIS DIOMEDE^. 187 



The legs are of moderate length for this family ; they increase in length 

 in successive order from the first pair to the last. 



The abdominal appendages are very long. Their proportions will be best 

 understood by reference to the figure. 



The exopods of the second maxillipeds are very small, — not longer than 

 the short ischial segments of these limbs. Upon the appendages behind 

 these, the exopods are reduced to the merest rudiments, to be detected only 

 by the use of a lens. In some specimens, indeed, the exopods of the pos- 

 terior appendages are altogether wanting. 



The branchial formula is as follows : — 



20 + (7) 



Length (female) 215 mm.; carapace, 101 mm.; rostrum, 42 mm. ; anten- 

 nal scale, 33 mm. ; telson, 33 mm. 



Station 3353. 695 fothoms. 2 fern. 



1 male. 



3 fern. 



3 fem. 



3 males, 1 fem. 



1 male, 1 fem. 



I have assigned this species to the genus Peneojysis after some hesitation. 

 Pmeopsis, a MS. name of A. Milne Edwards's adopted by Spence Bate, has 

 never been properly characterized. According to Bate, it was separated 

 from Pencils chiefly on account of the length of the antennular flagella, 

 which surpass the carapace in length. I have examined with some care a 

 specimen in this Museum from the " Blake " collection, labelled " Peneopsis 

 ocularis" by A. Milne Edwards. In this specimen the cervical sulcus is 

 deeply imprinted upon the surface of the caraj)ace, but the posterior oblique 

 portion of the conspicuous groove which runs from the cervical groove to 

 the hinder part of the carapace in P. diomedece is obsolete. There is a 

 very minute supra-orbital spine on the anterior margin of the carapace, 

 a strong antennal spine at the lower limit of the orbit, a small spine (hepatic?) 



* Very minute, but functional. 



