part 1 garth: pacific oxyrhyncha 237 



hiltoni Rathbun (1923a, p. 72). It remained for the present study to 

 disclose that, with one male abdominal somite less, Epialtoides hiltoni 

 was not even congeneric with Milne Edwards's species, and, together 

 with E. kingsleyi of the Atlantic and the Pacific E. paradigmus, n. sp., 

 and probably, E. murphyi, should be accorded independent generic treat- 

 ment as well. 



Epialtoides paradigmus, new species 

 Plate M, Figs. 1-6 ; Plate O, Fig. 8 ; Plate 26, Fig. 4 



Type: Male holotype, A.H.F. No. 404, and female allotype, A.H.F. 

 No. 404a, from Punta Cholla, Sonora, Mexico, shore, April 13, 1940, 

 collected by Steve A. Glassell. For additional material see Table 47. 



Measurements: Male holotype, length 10.8 mm, hepatic width 11.65 

 mm, branchial width 9.7 mm, length of rostrum 2.3 mm, width 1.75 mm, 

 cheliped 17.8 mm, merus 8.2 mm, manus 10.5 mm, dactylus 3.3 mm, 

 height of palm 3.6 mm, walking legs ca. 13.0, 9.1, 8.2, and 5.6 mm, 

 respectively. Female allotype: length 9.0 mm, hepatic width 9.0 mm, 

 branchial width 8.3 mm. 



Diagnosis: Rostrum elongate, sides converging, tip emarginate. Pre- 

 orbital tooth obtuse, prominent; postorbital tooth acute, inconspicuous. 

 Anterolateral projections limbed, exceeding branchial in size and span, a 

 ridge extending inward from each branchial lobe. Chelipeds of adult 

 male enlarged out of proportion to carapace and walking legs. A stout 

 tubercle on merus of external maxilliped. Sternal somites deeply 

 separated. 



Description: Carapace broader than long, smooth anteriorly and 

 posteriorly, anterolateral projections extending laterally to cover base 

 of chelipeds, almost limbed. Front longer than broad, sharply con- 

 stricted basally, convex from side to side, sides straight, tapering regularly 

 towards faintly bilobed tip. Orbital margins oblique, straight or slightly 

 sinuous, preorbital tooth obtuse, postorbital tooth small, slender, and 

 seeming to arise from the inner angle of the anterolateral margin. Hepatic 

 lobes inclined strongly outward and but little forward, their anterior 

 margins nearly horizontal and bearing a suggestion of a supplementary 

 lobe, their tips broadly rounded, their posterior margins converging to- 

 wards the cardiac prominence ; carapace widest at hepatic level. Branchial 

 lobes much smaller than the hepatic, more sharply pointed, and separated 

 from them by a broad U-shaped sinus. Posterior margin produced op- 

 posite intestinal region. Elevations of carapace more clearly marked 

 posteriorly than anteriorly, intestinal region anteriorly continuous with 



