250 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



more spinules are usually found between the apex and the two teeth 

 above. 



The direction of the rostrum is horizontal but opposite the eyes it 

 forms an arch, resuming- its horizontal direction beyond. In cross 

 section the rostrum is triangular with the short side below, the lower 

 margins arc carinate, the carina running' around to the supra-ocular 

 spines; the .length of the rostrum from the tip to the base of the free 

 portion of the supra-ocular spines is equal to the distance from the 

 latter point to the posterior margin of the gastric region. 



The supra-ocular spines reach the middle of the eyes; their free por- 

 tions are equal in length to the antero-lateral spines. 



The gastric pair of spines are larg-e and sharp with no intermediate 

 armature; in line outside is a small paired spine and in some specimens 

 a second much smaller one; an unusual spine in the gastric area is at 

 the intersection of the first ciliated line with the median line of the 

 carapace; the usual spines occur at the extremities of the ciliated line. 



■'~\ 



Fig. 3. — Cervimunid ■. princeps, x 2. 



There is a single paired spine in the fork of the suture and one in the 

 usual place just behind the suture. The lower margin of the merus 

 of the maxillipeds has a spine at each extremity. 



The chelipeds are elongated; spines are scattered over the merus 

 and carpus; the fingers are longer than the ridge of the palm; the 

 movable finger is armed with a row of spines on the inner surface just 

 below the ridge; numerous small spines are scattered over all surfaces 

 of the palm, except the lower; the chelipeds are hairy in the large 

 specimens; the ambulatory legs are squamose and hairy. 



The abdomen is armed. The 13 specimens examined show for the 

 most part eight spines on the second and fourth segments; the third 

 segment shows six, seven, or eight spines, but usually six; in the other 

 segments the number of spines also varies but not so frequentl3\ 



The length of the largest specimen examined is 147 nun. , carapace, 

 from the base of the rostrum, 27 mm. ; chelipeds, 102 mm. 



Type.— OA.i. No. 25404, U.S.N.M., from Albatross station 3698, in 

 153 fathoms off Honshu Island, Japan. 



