JVoies on North American Crustacea. 205 



and glabrous ; hand short, with a basal tooth on the superior margin of 

 the palm, projecting inward. Ambulatory feet mostly smooth and 

 glabrous (rarely pubescent); penult and antepenult joints compressed, 

 obtusely cristate above, with an undulated margin ; dactyli with rather 

 long pubescence. Color crimson or beet-red ; carapax sometimes lighter 

 in color, or yellowish, maculated with deep red. Length of the carapax 

 in a male, 0.54 ; breadth, 0.80 inch. In another, length, 0.50 ; breadth, 

 0.89. 



l^orthern specimens are more transverse, rougher, more 

 pubescent, and more sober in coloration than those found in 

 warmer latitudes. 



Found at Monterey, Cal., by Mr. A. S. Taylor, and at Ft. 

 Townsend, Puget Sound, by Dr. Suckley. 



Xaiitlio plaiiis§ifiiia, nov. sp. 



Carapax perfectly flat above, smooth and glabrous, excepting near the 

 frontal margins, where it is somewhat punctate in transverse rugae. 

 Regions moderately well defined, but not themselves areolated, except- 

 ing the gastric in its anterior part. Antero-lateral margin four-toothed, 

 teeth moderate. Chelipeds unarmed (excepting the tooth at the inner 

 angle of the carpus) ; surface smooth, punctate above ; meros minutely 

 granulated above, near the apex ; hand compressed, broad ; fingers black, 

 with light-colored tips ; pollex broad, with its black patch extending 

 some distance on the palm. Ambulatory feet smooth, compressed, 

 pubescent toward their extremities. Color a very dark bluish-orey, 

 marbled posteriorly. Length of the carapax in a full grown male, 0.3 ; 

 breadth, 0.46 inch. 



Cape St. Lucas. J. Xantus. 



Xaiitho laiuelllpeis, nov. sp. 



Carapax smooth, flattened, and somewhat octagonal in outline, the 

 antero-lateral margin having a strong angle or shoulder on the hepatic 

 region, just before the indistinct cervical suture. The broadest part of 



