72 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Chelipeds equal, rounded, smooth, and glabrous ; chelae small, com- 

 pressed, lower margin sinuous, upper margin of manus a little con- 

 vex; fingers shorter than palm, fitting together, dactylus somewhat 

 curved and armed near base with a small tooth which fits a slight 

 excavation in propodal finger. 



Legs short, subcylindrical and smooth; first leg shorter and nar- 

 rower than second; both have the dactyli short, curved, and closing 

 against the expanded end of propodus which is clothed at that 

 point with a little tuft of short, stiff hair; third leg about as long 

 as second, dactylus short and curved, but distal end of propodus not 

 expanded; last leg shorter than third, and slenderer than the rest, 

 dactylus slightly curved and very long and slender, equal in length to 

 propodus. 



Abdomen very wide, exceeding sternum. 



Measurements. Female (40448), length of carapace 5.7, width of 

 same 8 mm. 



Habitat. In shells of mollusks: probably Mytilus algosus Gould 

 (Smith), Calyptraea, species (Lenz), Crepidula dilatata (Coker). 



Range. Peru; Chile. 



Material examined. 



Ancon Bay, Peru; found with Crepidula dilatata Lamarck on 

 mussels; R. E. Coker, coll.; received from Peruvian Government; 

 1 female ovig. (40448). 



Talcahuano, Chile; Hassler Exped.; received from Mus. Comp. 

 Zool.; 1 female (22848). 



PINNOTHERES ANGELICUS Lockington. 



Plate 16, figs. 5 and 6. 



Pinnotheres angelica LOCKINGTON, Proc. California Acad. Sci., vol. 7, Dec. 1, 

 1876 (1877), p. 155 [10] (type-locality, Angeles Bay, Gulf of Cali- 

 fornia, in oysters; types not extant). Not P. angelicus Miers, Journ. 

 Linn. Soc. London, Zool., vol. 15, 1880, p. 86. 



Diagnosis. Female transverse, smooth, shining. Dactylus of sec- 

 ond leg much the longest. Prominent tubercle on basal joint of an- 



tennae. Dactylus of endo- 

 gnath attached to end of 

 propodus. 



Description of female. 

 Smooth, shining. Cara- 

 pace thin, easily wrinkled, 

 transverse, with anterior 



FIG. 34. PINNOTHERES ANGELICUS, OUTER MAXII/- margin stron^lv arcuate 



LII'ED OF FEMALE (17467), X 15 J. fe . 



posterior margin long, 



slightly concave, sides rounded; gastric region well defined; a large 

 pit on branchial region near inner angle. Front advanced, edge 



