774 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol.. XXIII. 



1 



Fig. 3.— Canckllus spongi 



(■OL.\'lN SPONGE. X Ij. 



of the antenna3 reach the middle of the eyestalks. The acicle is like 

 that of Oa7iGel/vst/niatus. 

 The depressions of the sides of the carapace are strong; the central 

 part is smooth; it is broader than lonj^ — broad- 

 est a little behind the middle. 



The carpal facets of the chelipeds are slightl}' 

 concave; the facets of the palms taken together 

 are convex, though a slight depression extends 

 down from the carpus of each; the lingers are 

 very short, the tips are coal ])lack; the facets 

 of the tii'st i)uir of ani))ulatory legs are all 

 slightly i'onvox, and. as is common in the genus, 

 the operculating surfaces are divided into lol)es 

 by transverse sutures. The sutures do not ex- 

 tend across the facets; on the chelipeds the 

 sutures are closed, while on the propodus and 

 dactjd of the ambulatory legs they are open on the outer margin and 

 closed on the inner. The entire opercular surface is crowded with 

 depressed granules; both margins of the aml)ulatory legs are well set 

 with bristles. 



The al>domen is spherical. The plate of the sixth segment, as in 

 Canc'elU(-'< or?iatus, is divided transversely by both a carina and a 

 channel; the anterior half has an evenly rounded margin armed with 

 spines. Bunches of hair are scattered over its surface. The poste- 

 rior part is short, and is armed with nuich smaller tubercles than is 

 the other species. 



The under surfaces of the ambulatory legs are mottled with orange 

 and white; the other parts are a light straw color. 



The specimen is a male, about 22 nun. in length, taken at station 

 2354, 20° 59' 30" north latitude, 86 23' 45" west longitude, 130 fath- 

 oms. Its carcinoecium is 

 a firm siliceous sponge. 



Ti/jji.—\J.S.}s.M. No. 

 9549, 



Cancellus spongicola is 

 more nearly related to C. 

 pai'falt'i Milne-Edwards and 

 Bouvier than to any other 

 species. A small specimen 

 of the latter shows the 



palms more deeply excavated and with the inner margins a little 

 more raised and more distinctly cut into lobes. The triangular 

 median projection of the front has a distinct raised margin, which is 

 altogether wanting in spongicola. The dactyls of the first pair of 

 aml^ulatory feet are nearly smooth, not lobed as in C. spongicola. 



Cancellus spongicola. Extre.mity of abdo- 



. MEN. X 8. 



