THE GEAPSOID CRABS OF AMERICA. 91 



PINNOTHERES SILVESTRII Nobili. 



Pinnotcres silvestrii NOBILI, Boll. Mus. Zool. Anat. Comp. R. Univ. Torino, 

 vol. 16, No. 402, 1901, p. 11 (type-locality, San Vicente, Chile; holotype 

 in Mus. Zool. Turin) ; Ilevista Chilena Hist. Nat., vol. 6, 1902, p. 235 

 (repetition of original description). 



Pinnotheres silvestrii KATHBUN, Proc. U. S. Nat. Mus., vol. 38, 1910, p. 587. 



Diagnosis. Entire body and appendages thoroughly calcified and 

 hard. Carapace without furrows. Dactyli of legs very short. 



Description of female (after Nobili). Carapace a little wider than 

 long, completely calcified and therefore very hard, flat except an- 

 teriorly and toward the lateral and posterior margins where it is bent 

 down ; bare and smooth with a luster like porcelain. Frontal margin, 

 pterygostomian region, infero-posterior parts and margin of abdo- 

 men covered with a grayish tomentum. No furrows on the carapace, 

 but two very slight and rather wide depressions near gastric region, 

 and two impressions at sides of cardiac region. Fronto-orbital bor- 

 der rather wide; front vertically deflexed and produced at sides where 

 it meets orbit in a very distinct acute lobe; between this lobe and 

 the interantennular partition, the frontal border is deeply sinuous. 

 Orbits invisible from above, subcircular; ocular peduncles short, 

 stout, obconical. Antero-lateral margin rather long, separated from 

 the anterior margin by a fairly well-marked angle, and from the 

 postero-lateral margins by a more distinct angle; these last are 

 directed obliquely backward. 



Maxillipeds slightly oblique and rather pilose; merus subellipsoid, 

 broadly truncate at end; dactylus claw-shaped, exceeding in length 

 the preceding segment. 



Chelipeds rather large, subequal, calcified like the carapace; out- 

 side bare and smooth, inside thickly pilose ; fingers somewhat curved, 

 excavated and incurved at tip, prehensile surface bearing long, stout 

 hairs. 



Legs short, stout, calcified, pilose along lower surface, along articu- 

 lations and on outer face of merus; dactyls very short. Abdomen 

 calcified. 



Measurements. Female holotype, length of carapace 12, width of 

 same 14 mm. 



Range. Known only from the single type female taken at San 

 Vicente, Chile. 



PINNOTHERES MARGARITA Smith. 



Pinnotheres margarita, SMITH, in Verrill, Amer. Nat., vol. 3, 1869, p. 245, 

 footnote (type-locality, in the Pearl Oyster, Margaritophora fimbriata, 

 of the Bay of Panama ; holotype female in Peabody Mus. Yale Univ.) ; 

 Trans. Connecticut Acad. Arts and Sci., vol. 2, 1870, p. 166. 



Diagnosis. Legs of second pair unequal in female, propodus and 

 dactylus of right leg much longer than those of left. Body and 



