THE GEAPSOID CEAB8 OF AMERICA. 171 



SCLEROPLAX GRANULATA Rathbun. 



Plate 37, figs. 1-3. 



Scleroplax granulatus RATHBUN, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 251 



(type-locality, Bnsenada, Lower California; female holotype, Cat. No. 



17497, U.S.N.M.) ; Harriman Alaska Exped., vol. 10, 1904, p. 188, pi. 



7, fig. 5. WEYMOUTH, Leland Stanford Jr. Univ. Publ., Univ. Ser. 



No. 4, 1910, p. 59, text-fig. 8. 

 Pinnixa (Scleroplax) granulata HOLMES, Occas. Papers California Acad. 



Sci., vol. 7, 1900, p. 94. 



Diagnosis. Carapace high, not areolated, less than twice as wide 

 as long. Chela of male very wide, of female very feeble. Legs 

 similar. 



Description of female. Carapace smooth and punctate in center, 

 finely granulate elsewhere; antero-lateral margin of the dorsum 

 marked by an arcuate, granulate ridge, which stops short of the 



a 



FIG. 109. SCLEROPLAX GRANULATA. a, ABDOMEN OF HALE (49247), X 15J J 6, ENDOG- 



NATH OF ODTER MAXILLIPED OF FEMALE PARATYPE, X 15J. 



postero-lateral margin, and at cervical suture; a separate, blunt 

 prominence on hepatic margin. Front straight as seen from above, 

 depressed at middle and outer corners; orbits ovate, less than half 

 as wide as front. Merus of maxillipeds granulate, an alate expansion 

 on either side ; last two joints of palpus elongate, medially grooved, 

 last joint reaching slightly beyond preceding. Chelipeds weak, 

 granulate, especially on dorsal surface; thumb horizontal, with 

 outer ridge, tip acute ; fingers not gaping. Legs slender, third pair 

 longest, dactyli slightly curved, last one nearly straight. 



Sexual variation. In male, chela much larger, propodus nearly 

 smooth, with convex margins, thumb shorter than wide, with a large 

 tooth occupying greater part of prehensile edge and largely filling 

 gape caused by the curved dactylus. Abdomen constricted between 

 last two segments, margin of last segment rounded. Carapace less 

 extensively granulated. In the single male from San Francisco Bay 



