Indian Deep-sea Dredging. 167 



it is divided by a distinct cervical groove into two lobes, the 

 anterior of which is somewhat the higher and longitudinally 

 somewhat the more convex of the two. 



The anterior margin of the carapace bears on each side two 

 spines — the one smaller, situated just behind the edge of the 

 orbital sinus, and answering in all probability to the antennal 

 spine of the Penasidea ; the other larger, which arises from 

 the margin itself, opposite to the insertion of the antenna, and 

 is, there is little doubt, a true branchiostegal spine. About 

 midway between the branchiostegal spine and the obtuse 

 extra-orbital angle on each side the anterior margin projects 

 a process of about the same size and shape as the latter, and 

 hence presents an angularly sinuous or zigzag outline between 

 tlie two spines. The branchiostegal spine is continued back- 

 wards along the side of the carapace as a well-defined slightly 

 upwardly concave ridge ; this is subacute nearly as far as the 

 hepatic region, and thence blunt to its abruptly upcurved 

 extremity near the hinder end of the carapace ; it curves 

 upwards for a short distance from its origin, then descends 

 almost imperceptibly to about the middle of its length, whence 

 it rises by a no less gentle ascent to its upturned extremity ; 

 it emits three branches — one, faint, from the hepatic region, 

 upwards and forwards towards a point in the anterior margin 

 which is just internal to the antennal spine ; a second, as well- 

 defined as itself, from the point at wliich it is intersected by 

 the cervical groove, straiglit downwards and backwards 

 towards the inferior margin ; and a third, equally well-defined, 

 from a point a little to the rear of that from which the second 

 is given off, upwards, inwards, and backwards, so as to mark 

 out the upper boundary of the subjacent branchial chamber. 



The terga of the abdominal somites are increasingly carinate 

 from the second to the fourth ; the carina of the fourth is 

 faintly notched, as in Acanthephyra^ and terminates poste- 

 riorly in a strong spine. Those of the remaining somites are 

 transversely rounded. 



The telson, which wants its extreme tip, agrees, as far as it 

 is preserved, with the description of that of Parapasiphae 

 sulcatifrons, S. 1. Smith. 



The eye-peduncles ai'e compressed from above downwards 

 and bear on the inner and upper margin, at a short distance 

 from the edge of the cornea, a small conical tubercle, which is 

 directed inwards and slightly forwards ; the compressed 

 hemispherical and distinctly faceted cornea occupies the whole 

 width of their apex, upon which it is somewhat obliquely set ; 

 and their pigment is bright brown in spirit. 



The peduncle of the antennules agrees with Prof. S. I. 



