THE CANCROID CRABS OF AMERICA 



249 



Material examined. — Cape St. Lucas, Lower California, Mexico; 

 John Xantus; 1 male, 1 female, cotypes (1251, M.C.Z.). 



Manzanillo, State of Colima, Mexico; on drifted pile; July 17, 

 1913; C. R. Orcutt; 1 male (46078). 



Panama: Capt. John M. Dow; 1 female (4079). Low tide, rocks; 

 May-July, 1924; E. Deichmann; 1 female (60823). 



South side of Point Santa Elena, Ecuador; among brown sea 

 anemones; September 16, 1926; W. L. Schmitt; 2 males (60962). 



PLATYPODIA GEMMATA Rathbun 



Platypodia gemmata Rathbun, Proc. Washington Acad. Sci., vol. 4, 1902, p. 279, 

 •pi. 12, figs. 5 and 6 (type-locality, Albemarle Island, Galapagos Islands; 

 type, Cat. No. 24850, U.S.N.M.). 



Diagnosis. — Internodular depressions filled with short hair. Eleva- 

 tions mostly subcircular, granulate. 

 Antero-lateral rim extremely narrow. 

 Palm short and high. 



Description. — Anterior two-thirds of 

 carapace divided into about twenty 

 lobules, for the most part circular, 

 except the mesogastric lobule; covered 

 with crowded depressed granules and 

 separated from each other by depres- 

 sions filled with a dense furry coating. 

 Front with a thin bilobed edge, lobes figure 4o.-platypodia gemmata, male, 



Ti,, . .. 1,1 . COTYPE, X3. a: Dorsal VIEW. 6. Wrist 



slightly sinuous. Antero-lateral crest ^j,j, ^^^^^ 



narrow, thin, covered above by a short 



fringe of fur, edge granulate; below are "visible three fissures dividing 



the margin obscurely into four lobes. Postero-lateral borders short 



and deeply cut. 



Related to rotundata, but the nodules are of different shape; the 

 mesogastric is not linear and pointed anteriorly, the protogastric 

 nodule is single, not subdivided by a longitudinal furrow. The 

 granulation of the nodules of the anterior-median part of the carapace 

 is very fine and sharp, not rough and uneven as in rotundata. The 

 marginal rim is even narrower than in the allied species. Chelipeds 

 similar in the two. 



Measurements. — Ovigerous female, cotype, length of carapace 6.8, 

 width 9.6, fronto-orbital width 4.9, width of front 2.8 mm. 



Range. — Known only from the type-specimens from the reef north 

 of Tagus Hill, Tagus Cove, Albemarle Island, Galapagos Islands; 

 1898-1899; Hopkins Stanford Expedition ; 1 male, 1 ovigerous female 

 (24830), 2 immature females (Stanford Univ.). 



