Boone, Crustacea, Cruises of "Ara" and "Alva" 215 



very convex, from 1.3 to 1.5 times as long as the fingers, which 

 are slender, tapered, acuminate, incurved distally with a deep 

 buttonhole-like gape, wider proximally; there is a large molar 

 located about one-third of the length from the base, the distal 

 two-thirds of the cutting edges meeting, regularly serrate, with 

 weak teeth. 



The basal antennal joint bears a strong tooth at the external 

 distal angle. 



The female chelipeds are weak, slender, the merus being only 

 12.5 millimeters long, granulose, with the upper and lower lateral 

 margins irregularly spinose, an acute tooth at the upper distal 

 angle and a large rounded node at the lower one; the carpus is 

 short, 4.5 millimeters long, convex, suboval, irregularly spinose; 

 the propodus and dactyl elongate, 18 millimeters long, the palm 

 being 8 and the dactyl 10 millimeters, with the palm but little 

 inflated, granulose, the fingers subequal, meeting the greater 

 part of their length, a weak, longitudinal, rounded ridge on the 

 outer surfaces, 18 to 20 small, triangular teeth, tips acuminate, 

 incurved. 



The ambulatories of both sexes are exceedingly long, slender, 

 decreasing moderately in length from the first to fourth pairs; 

 the meral articles are greatly elongated, with an upper distal 

 spine; the carpus and propodus together about equal the merus 

 in length, the carpus being tw^o-fifths of this; the dactyl being 

 slightly more than three-fourths as long as the propodus, slender, 

 with the distal half very curved and dorso-ventrally expanded, 

 apex very acuminate. 



References : Anasimus fugax, Milne Edwards, A., Crust. Regne 

 Mexico, 1880, p. 350, pi. 31-A, figs. 1-ld; Bull. Mus. Comp. 

 Zool., 1880, vol. VIII, p. 9.— Rathbun, M. J., Bull. U. S. 

 Fish. Comm. for 1900 (issued 1901), vol. XX, pt. 2, p. 59.— 

 Milne Edwards, A., et Bouvier, E. L., Mem. Mus. Comp. 

 Zool. 1923, vol. XLVII, p. 366, text fig. 16.— Rathbun, M. J., 

 Bull. CXXIX, U. S. Nat. Mus., 1925, p. 64, pi. 23, figs. 5 and 

 6, pi. 211. 



Remarks : Critical examination of the type and related speci- 

 mens described by Miss Mary J. Rathbun as Anasimus latus 

 show these not only to be devoid of any valid specific characters, 



