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 setaj. 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 fern. ovig. 



The genus Euprognatha is represented in the West Indian region by four 

 species {E. rastelUfcra Stimps., E. inennis A. M. Edw., E. graciUpes A. M. Edw., 

 and E. 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, etc. One species, Euprognatha 

 bifida Rathb.jt 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. Edw. 



Crustaces de la Region Mcx., p. 135, 1S78. 



Sphenocarcinus agassizi Rathb. 

 Plate l, 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 fouud on pp. 264-266. 

 t Proc. U. S. Nat. Mus., XVI. 231, 1893. 



