220 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



MURSIA GAUDICHAUDH (Milne Edwards) 



Plate 66, Figures 1-3; Plate 67, Figures 1-6 



Platymera gaudichaudii Milne Edwards, Histoire naturelle des Crustac^s, vol. 2, 

 p. 108, 1837 (type locality, Chile; type in Paris Mus.). — Milne Edwards 

 and Lucas, in d'Orbigny's Voyage dans FAmdrique m^ridionale, vol. 6, 

 p. 28, 1843; vol. 9, atlas, pi. 13, fig. 1, 1847. 



Platymera californiensis Rathbun, Proc. U. S. Nat. Mus., vol. 16, p. 253, 1893 

 (type locality, off Point Ano Nuevo, Calif., 70 fathoms; type, U. S. N. M. 

 no. 15606). 



Platymera gaudichaudi Porter, Eev. Chil. Hist. Nat., vol. 25, p. 421, pi. 38, 1921. 



Diagnosis. — Posterior margin of carapace entire; lateral spine 

 pointing directly outward. Two spines on distal crest of arm; 

 ridge on lower part of manus unidentate. 



Description. — Carapace densely granulate. Nine short rows of a 

 few tubercles each: one row median, one protogastric (paired), the 

 remainder branchial. On the front a pair of thick divergent teeth; 

 behind them a depressed tooth forming inner angle of orbit and above 

 that a blunt tooth. Anterolateral margin with from 14-17 very small 

 teeth separated by concave lines of granules, the interspaces greater 

 at middle of carapace arch than toward either end. Six teeth point- 

 ing distad on upper margin of manus; above the lower margin a 

 prominent granulate and unidentate ridge; at middle of manus a 

 line of five or six tubercles separated by coarse granules. Dactyli 

 of ambulatories long, slender, carinated. On the sternum at base of 

 chelipeds a large blunt downward pointing pyramidal tooth. 



Color. — Ochraceous; tubercles and spines of carapace and stripes on 

 ambulatories rufous. (Milne Edwards and Lucas.) Broccoli brown 

 with spines and tubercles ochraceous. Hands lighter than carapace, 

 lower margins white. (W. L. Schmitt.) 



Measurements. — Male type (15606), length of carapace 64, width to 

 base of spine 95, length of spine 14 mm. 



Range. — California to Chile; 26 to 218 fathoms. 



Material examined. — See table 71, page 222. 



Genus ACANTHOCARPUS Stimpson 



Acanthocarpus Stimpson, Bull. Mus. Comp. Zool., vol. 2, p. 152, 1871 (type A. 

 alexandri Stimpson). 



Body regularly ovate, strongly convex in its anteroposterior dorsal 

 outline. Carapace as broad as long, broadest in front. Antero- 

 lateral continuous with posterolateral margin; the latter armed with 

 a strong tooth. Fronto-orbital region more or less than one-third 

 width of carapace. Eyes large. External maxillipeds not reaching 

 to anterior extremity of buccal area; ischium truncate in front, with- 

 out projecting at inner angle, which, like the outer one, is a right 

 angle; merus shorter and broader than ischium, and narrowed in 

 front, with the palpus attached at the antero-interior angle; exognath 



