Boone, Crustacea, Cruises of "Ara" and "Alva" 277 



margin of the dactyl. The dactyli comprise about two-fifths of 

 the entire length of the propodus ; the propodal finger is a little 

 broader proximally than the upper finger and has the cutting edge 

 excavate, the apex moderately upcurved; the hinged finger is 

 swung obliquely, with the upper margin beaded or granulose, the 

 apex rounded and bent inward and the cutting edge convex. 

 There is a concave hiatus on the inner face of the cutting edge 

 not visible on the external face; this hiatus is filled by a dense 

 soft pilose brush on all specimens examined. 



The Chilean specimens give the following measurements, all 

 stated in millimeters : 



References : Porcellana granulosa, Guerin de Meneville, F. E., 

 Bull. Sci. Nat. France, 1835, p. 115; Mag. de Zool. Paris, 

 1838, p. 6. no. 9, pi. 26, fig. 1.— Rathbun, M. J., Proc. U. S. 

 Nat. Mus., vol. XXXVIII, 1911, p. 617. 



Porcellana laevigata, GuERiN, DE Meneville, loc. cit., 1835; also 

 loc. cit., 1838. 



Porcellana striata, MiLNE Edwards, H., Hist. Nat. Crust., 1837, 

 t. II, p. 116. 



Po7xellana cinctipes, Randall, J. W., Journ. Acad. Nat. Sci. 

 Phila., 1839, vol. VIII, 1839, p. 136. 



Porcellatia rupicola, Stimpson, W., Proc. Boston Soc. Nat. Hist., 

 1857, vol. VI, p. 85; Journ. Boston Soc. Nat. Hist., 1857, vol. 

 VI, p. 480, pi. 19, fig. 2.— Bate, C. S., in Lords, J. K., Nat. 

 in Vancouver Is., 1866, vol. II, p. 276. 



Petrolisthes rupicolus, Stimpson, W., Proc. Acad. Nat. Sci. 

 Phila., 1858, vol. II, ser. 2, p. 227.— LOCKINGTON, W. S., 

 Ann. and Mag. Nat. Hist., 1878, ser. 5, vol. II, p. 396.— New- 

 combe, C. F., Bull. Nat. Hist. Brit. Columbia, 1893, vol. I, 

 p. 30. 



