KEMP—PELAGIC CRUSTACEA DECAPODA 67 
The rostrum is slender, slightly damaged at the extreme apex, and reaches to about 
two-thirds the length of the antennal scale. On the upper margin there are four small 
widely-spaced teeth, while a fifth, which appears to have existed near the apex, is broken 
off. On the lower margin there are six similar but larger teeth. 
The carapace is very strongly arched dorsally and its greatest depth is more than 
half its extreme length including the rostrum. In the mid-dorsal line it is very sharply 
carinate and is furnished with a series of small spinules about 70 in number, which extend 
from the rostral base as far as the posterior margin. Laterally there are several pro- 
minent longitudinal carinee, three of which extend throughout almost the whole length of 
the carapace. The uppermost of these, the post-orbital carina, commences very close to 
the posterior margin, defines the upper limit of the branchial region, and is continuous 
anteriorly with the carima on the side of the rostrum. Before reaching the base of the 
latter it gives off a small branch from its lower side which runs towards the back of 
the orbital notch, but disappears before reaching the margin. On comparison with other 
species, such as NV. armata, Smith, it will be seen that this branch is the real anterior 
extremity of the post-orbital carina. Another short carina curves upwards and forwards 
from the margin of the orbital notch and fuses with the lateral keel of the rostrum. In 
the posterior half of the carapace, immediately below the orbital and parallel with it, 
there is a short carina and there are also two long carinze near the inferior margin. The 
uppermost of the latter, the post-antennal carina, begins very near the posterior margin 
and terminates anteriorly, before reaching the margin, in a sharp outstanding spine which 
projects over the base of the antenna. This carina is connected with the orbital by a 
well-defined oblique ridge separating the branchial and hepatic regions. The other 
earina, the marginal, runs close to the inferior margin, fading away shortly before reaching 
the anterior end of the carapace; it is continuous behind with the fine keel that borders 
the posterior edge. On the anterior margin a sharply rounded lobe defines the inferior 
limit of the orbit and immediately below this lobe there is a short spine. The antero- 
inferior angles are broadly rounded. The surface of the carapace is finely corrugated, 
especially on its postero-lateral portions and on either side of the dorsal crest. 
The eyes are well pigmented ; the cornea is broader than the stalk and is set very 
obliquely on it. The small ocellus is distinct in dorsal view and is connected with the 
cornea. The antennal scale is about two and a half times as long as wide; its distal 
margin is convex and terminates in a spine which reaches a little beyond the narrow apex 
of the lamellar part. The upper (and outer) ramus of the antennular peduncle is greatly 
thickened at the base. This swollen portion comprises rather more than fifty joimts and 
extends, in the single male examined, beyond the apex of the antennal scale by two-thirds 
the length of that organ. 
Tn the second maxilla the two lobes of the distal lacinia project beyond the proximal 
lacinia, the whole appendage resembling that of Acanthephyra purpurea. The endopod 
of the first maxillipedes differs from that of Hymendora, and resembles Acanthephyra in 
being composed of three distinct segments. The third maxillipedes reach a little beyond 
the apex of the antennal scale, as do also the pereeopods of the third and fourth pairs. 
9—2 
