68 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Genus ERILEPTUS Rathbun 



Erileptus Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 226; type, 

 E. spinosus Rathbun. 



Carapace pyriform, convex, regions well defined; rostrum simple, 

 slender; postorbit^ and supraorbital spines present. Sexes differing 

 in shape of carapace, postorbital spine and cheliped. Basal article 

 of antennae long and narrow, with spine at distal end. Antero- 

 internal lobe of ischium of outer maxilliped large and strongly 

 advanced; merus sub triangular, the anterior margin the longest; 

 outer, or principal, margin of next article nearly as long as outer 

 margin of merus and almost straight until near distal end where it 

 forms an elbow; terminal article unusually long. Chelipeds of male 

 extremely long. Ambulatory legs very slender, decreasing in length 

 from first to fourth pair and in male much shorter than chelipeds. 



Contains only one species. 



ERILEPTUS SPINOSUS Rathbun 



Plates 212 and 213 

 Erileptus sp^nos^ls Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 227 

 (type-locality, off San Diego, California, 36 fathoms, station 2934, Alba- 

 tross; holotype. Cat. No. 17341, U.S.N.M.); Harriman Alaska Exped., 

 vol. 10, 1904, p. 171, pi. 10, fig. 1. — Holmes, Occas. Papers California 

 Acad. Sci., vol. 7, 1900, p. 21. — Weymouth, Stanford Univ. Publ., Univ. 

 Ser., No. 4, 1910, p. 27, pi. 3, fig. 7. 

 Anasimus rostratus Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 227 

 (type-locality, NW. of Cerros Island, Lower California, 58 fathoms, 

 station 2983, Albatross; (holotype, Cat. No. 17340, U.S.N.M.); Harriman 

 Alaska Exped., vol. 10, 1904, p. 171, pi. 10, fig. 4.— Weymouth, Stanford 

 Univ. Publ., Univ. Ser., No. 4, 1910, p. 27. 

 Anasimus spinosus Schmitt, Univ. California Publ. in Zool., vol. 23, 1921, 

 p. 196, text-fig. 121. 

 Description. — Male: Carapace behind the rostrum equilaterally 

 triangular, and spinous, as follows : Two median spines, one gastric, 

 the other cardiac; one long branchial spine, with a small spine or 

 spinule considerably in front of it and two or three small spines on the 

 outer margin ; a strong marginal hepatic spine ; tv/o very small spines 

 arranged transversely on the gastric region, well in advance of the 

 median spine; a slender spine on orbital arch. Rostrum slender, 

 about one-half as long as postrostral portion of carapace, margins 

 spinulous. Postorbital spine very small, sometimes tuberculiform, 

 at some distance behind eye. A spine on first abdominal segment. 

 Abdomen and sternum granulate, segments of sternum separated by 

 deep grooves. Antero-external lobe of merus of maxillipeds bent 

 strongly downward. 



Chelipeds three or four times as long as carapace, slender, granu- 

 late; arm with a row of spinules along inner side and a spine at superior 



