68 
THE VOYAGE OE H.M.S. CHALLENGER 
four thickened carime run forwards nearly to the anterior edge of the somite, separated 
from each other by interspaces which are about equal to the ridges in width. 
The two submedian carinse are nearly parallel and longitudinal, while the two outer 
or submarginal ones diverge anteriorly, and have their inner edge obscurely divided 
into three rounded lobes. The telson is deeply notched on the middle line, and is 
slightly wider than long. In a ventral view (PL XV. fig. 12) each of the rounded lobes 
which borders the median notch is seen to consist of three marginal spines, crowded 
backwards, but with the submedian longest, the intermediate shorter, and the external 
shortest. No trace of these spines is visible in a dorsal view, and the dorsal outline of 
the telson consists of a single obtusely rounded lobe on each side of the triangular 
median notch, which is fringed with hairs. 
The middle of the dorsal surface of the telson is occupied by a broad wedge-shaped 
median ridge or carina, which is wide anteriorly and narrows posteriorly to a rounded 
point which is scarcely elongated above the general surface of the telson. This carina 
is surrounded on all sides, except at its anterior end, by a depression or groove, outside 
which there is on each side a greatly thickened submedian carina or ridge, the general 
course of which is longitudinal, although it is slightly curved, with the convexity away 
from the middle line. 
The tips of the extended uropods reach nearly as far backwards as the telson. The 
paddle of the exopodite is very small, that of the endopodite longer and nearly 
triangular. The basal joint has a single acute spine on its dorsal surface, and the two 
ventral spines are short and stout, the outer being the larger and longer. 
The eyes are cylindrical, with the convex curved portion obliquely placed and 
running backwards on the outside of the base. The ocular segment is exposed, broad, 
and deeply notched on the middle line under the median spine of the rostrum. The 
antennae are short, and the basal joint of the second ends in an acute spine. The 
dactylus of the raptorial claw is greatly swollen at the base, with a deep notch on its 
outer edge. The tip of the dactylus is gently and regularly curved to the acute point, 
and its inner edge is barbed with minute serrations, nearly to the base. The edge 
of the second joint is bordered by minute dentations. 
The exposed thoracic legs are long and slender. 
The dorsal surface of the body, with the exception of the sixth abdominal somite and 
telson and uropod, is highly polished, while these are rough. 
Habitat . — One female specimen from St. Vincent, Cape Verde Islands. 
Colour . — In the alcoholic specimen the telson and sixth abdominal somite and 
uropods are dirty- white, while the rest of the body is highly polished and very dark 
brown, except a transverse strip of light yellowish-brown across the carapace, posterior 
to the middle point of its length, and a corresponding light band across the enlarged 
joint of the second maxilliped. 
