SPHENOCARCINUS AGASSIZI. 7 
face of the abdomen is thickly beset with larger bead-like tubercles; the 
first segment bears a prominent, granulated, blunt, median spine, and there 
is a rudiment of one on the three following segments. The chela is slender 
and covered with small tubercles; the other segments of the cheliped and all 
the ambulatory legs are provided with small spines, tubercles, and scattered 
curled sete. The spines attain their greatest development on the merus 
joints of the legs, the largest of all being on the proximal half of the merus 
of the chelipeds and at the distal end of the merus of the ambulatory legs. 
Length of carapace, 7 mm.; breadth, 6 mm. 
Station 3369.* 52 fathoms. 2 fem. ovig. 
The genus Luprognatha is represented in the West Indian region by four 
species (£. rastellifera Stimps., E. mermis A. M. Edw., E. gracilipes A. M. Edw., 
and £. acuta A. M. Edw.), from depths ranging from 27 to 248 fathoms. 
The present species may be distinguished from all of these by its coarsely 
granulated carapace and abdomen, taken in connection with the laciniated 
and granulated spines of the frontal region, ete. One species, Huprognatha 
bifida Rathb.,f has been recently described from the Gulf of California, 
29-40 fathoms. It may be distinguished by the absence of an interan- 
tennular spine. 
SPHENOCARCINUS A. M. Epw. 
Crustacés de la Région Mex., p. 185, 1878. 
Sphenocarcinus agassizi Rarus. 
Plate I, Fig. 3, 3°. 
Proc. U. S. Nat. Mus., XVI. 231, 1893. 
In this species the whole surface of the body and limbs is clothed with 
a short, close pubescence. The rostral horns are long, horizontal, and termi- 
nate in blunt points. A more or less broken, longitudinal, rounded ridge 
runs along the median line of the carapace, from the base of the rostrum 
to the intestinal region, rising into a prominent tubercle on the gastric area. 
A transverse flattened tubercle on the cardiac region, and two roundish ones 
on each branchial region. The antero-lateral margin of the carapace is 
armed with four prominent tubercles or large teeth (counting the one at 
the external orbital angle); these teeth increase in size successively from 
* A full record of the stations will be found on pp. 264-266. 
+ Proc. U. S. Nat. Mus., XVI. 231, 1893. 
