Boone, Crustacea, Cruises of "Ara" and "Alva" 219 



which 40 millimeters represents the dactyl ; the palm is narrowed, 

 compressed subcylindrical, spinulose similar to the merus, dilated 

 slightly near the base of the fingers, which latter are slightly 

 deflected and also have their apices curved inward. The fingers 

 are nearly equal, slender, long, rounded, granulose, distally 

 tapered to acuminate, incurved apices. The lower finger has a 

 hiatus proximally and eleven, low, blunt, triangular teeth along 

 the distal three-fourths of the margin; the upper finger has a 

 large molar midway the proximal hiatus and well separated from 

 the eleven teeth which interfit with those of the opposed finger. 

 The four pairs of ambulatories are similar, very long and 

 slender with strong, slender, procurved, acuminate dactyli. These 

 legs decrease in the order 1, 2, 3, 4; the fifth pair of legs being 

 scarcely three-fifths as long as the first pair. In the larger speci- 

 men, the first pair of ambulatories is only a few millimeters 

 shorter than the chelipeds, but in the second specimen, a male 

 with the carapace about three-fifths as large as that of the first 

 specimen, the ambulatories exceed the length of the chelipeds, 

 which are subequal and only 185 millimeters long, the ambula- 

 tories being 210 millimeters long. 



References : Amathia crassa, Edwards, A. Milne, Crust. Regne 



Mexico, 1879, p. 203, pi. 28, figs. 2-2b; Bull. Mus. Comp. 



Zool., 1880, vol. VIII, p. 3. 

 Amathia agassizii. Smith, S. I., Bull. Mus. Comp. Zool., 1882, 



vol. X, 1, pi. 2, figs. 2 and 3 ; Proc. U. S. Nat. Mus., 1883, vol. 



VI, p. 3 ; Rept. U. S. Comm. of Fish and Fisheries for 1882 



(issued 1884), p. 346. 

 Anamathia crassa, Smith, S. I., Proc. U. S. Nat. Mus. 1884 (is- 

 sued 1885), vol. VII, p. 493.— Rathbun, M. J., Proc. U. S. 



Nat. Mus., 1894, vol. XVII, p. 60, pi. 1, fig. 4; Bull. Labr. 



Nat. Hist. State Univ. Iowa, 1898, vol. IV, p. 254, pi. 14.— 



Faxon, W., Mem. Mus. Comp. Zool., 1895, vol. XVIII, p. 10. 

 Amamathia agassizii, Smith, S. I., loc. cit., p. 493, vol. VII, 1884 



(1885) ; Rept. U. S. Comm. Fish and Fisheries, for 1885 



(1886), p. 624, pi. 1, figs. 2, 3, 3-c. 

 Scyramathia agassizi, Sars, G. 0., Norske Norhhavs Exped. 



Crust, 1885, vol. I, p. 274. 

 Rochinia crassa, Rathbun, M. J., Bull. CXXIX, U. S. Nat. Mus., 



1925, p. 210, pis. 68, 69 and 226. 



