18 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi 



other extremit3\ This segment projects down over the last segment 

 at either side. The last segment has a deep excavation at its posterior 

 extremit}', around and above which is a carinated ridge extending 

 entirely around the whole of the posterior half of the segment. Two 

 small longitudinal ridges are in the center of the segment. The inner 

 branch of the uropoda is ver}' short, not reaching the extremity of 

 the abdomen by some distance; it is quadrangular in shape, with 

 sides nearly parallel, and obliquely truncated at the end. The outer 

 branch of the uropoda is long, curved, and pointed at the end, resemb- 

 ling a hook somewhat. 



The color is a light yellow. In appearance the little isopod is very 

 rough and rugged looking. 



The onl}^ specimen is a male. 



Genus DISCERCEIS Richardson." 



Thorax composed of seven segments, the seventh segment not being 

 produced backward in any processes. Abdomen composed of two 

 segments, the first of which has indications of partly coalesced seg- 

 ments, and is not produced backward in any processes. Terminal 

 abdominal segment Avith a median notch, which bears a tooth or lobe 

 in the center. 



Both branches of the fourth pleopoda are similar, with transverse 

 folds, fleshy, and without plumose, marginal satfe. 



Exopod of the fourth pleopod unjointed. 



Exopod of the third pleopod jointed, and composed of two segments. 



Branches of uropoda unlike, strongly dissimilar; inner branch short, 

 rudimentary; outer branch long and somewhat curved. 



The type of the genus is Cilicsea granulosa Richardson. 



DISCERCEIS GRANULOSA Richardson. 



Cilicsea granulosa Richardson, Proc. U. 8. Nat. ]\Ius., XXI, 1899, p. 841, tig. 18; 



Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 186-187; Bull. U. S. Nat. Mus.; 



No. 54, 1905, pp. 309-310, tig. 335. 

 Discerceis granulosa Richakdson, Bull. U. S. Nat. Mus., No. 54. 1905, p. x. 



Local it y.—Cerros Island, Lower California. 



Depth.— 20 fathoms. 



Collection of the U. S. National Museum. 



The surface of the body is densely granulated; the granules are 

 large and close together. Width, 4^ mm. ; length, 9 mm. 



The head has the anterior margin thickened and produced in a small 

 median point, on either side of Avhich the margin is lobate. The eyes 

 are situated post-laterally. The first pair of antennje extend to the 

 posterior margin of the first thoracic segment; the first article of the 

 peduncle is o])long; the second article is short. The second pair of 

 antennae extend to the posterior margin of the third thoracic segment. 



«Bull. U. S. Nat. Mus., 1905, No. 54, p. x. 



