156 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Description. — Antero-lateral margin of carapace with two large 

 triangular lobes; the hepatic lobe has a shallow tooth on its anterior 

 margin ; this margin is transverse, and its distance from the end of the 

 rostrum either exceeds (as in Kingsley's figure)., or is less than, its 

 distance from the posterior margin of the carapace. Rostrum 

 elongate-oblong, bilobed at tip. Cheliped strong, longer than first 

 ambulatory. Legs slender, cylindrical, penultimate article bearing 

 below distal to its middle and also at its proximal end (save in first 

 pair) , a bunch of setae which simulates a spine. 



Measurements. — Male, cotype, length of carapace 14, width 11, 

 length of cheliped 18 mm.; female, cotype, length 14, width 12 mm. 



(Lockington) . Male (Patos 

 Island), median length 21, 

 posterior width 16 mm. 



Range. — West coast of Mex- 

 ico, in Gulf of California. 

 Fig. 57 d.— propodus of second eight leg to show Found at low tide Under stones 



TWO TUFTS OF HAIR, MALE, SAN MARCOS, X 12 ^^^ -^ ^^^.^J (LockiugtOn) . 



Material examined. — Mexico: Patos Island, Gulf of California; at 

 anchorage, 4.5 fathoms; May 23, 1921; Fred Baker, California 

 Academy Expedition; 1 male, paper-shell (Cal. Acad.). San Marcos 

 Island; on kelp; June, 1921; Johnson and Baker, California Academy 

 Expedition; 1 male (Cal. Acad.). 



Remarlcs. — Although the type-specimen is not extant, it is possible 

 to determine the species from pencil drawings (fig. 57, a, h, c) made 

 by Kingsley from what was probably a cotype. By comparing these 

 with the specimens in hand, it became certain that the propodal 

 articles of the ambulatories are not armed with a spine as represented 

 by Lockington and Kingsley but are furnished with setae crowded 

 together in a socket and of varying length so as to form a pointed mass 

 simulating a spine. 



^ EPIALTUS HILTONI Rathbun 



Plate 46, figs. 1 and 2 



Epialtus hiltoni Rathbun, Proc. Biol. Soc. Washington, vol. 36, 1923, p. 72 

 (type-locality, Laguna Beach, California; holotype, Cat. No. 50599 



U.S.N.M.). 



Diagnosis. — Rostrum oblong, bilobed. Hepatic lobe widespread, 

 with a tooth or tubercle on anterior margin. Hand very long, fingers 

 short. 



Description. — Carapace high in median region; lateral wings 

 broad, ascending; anterior or hepatic lobe much the larger, inter- 

 vening sinus deep; width at branchial regions a little greater than, or 

 just equal to, that at hepatic regions. The posterior margin of the 

 hepatic lobe is convex, the anterior is oblique (in the half grown) to 



