Boone, Crustacea, Cruises of ''Eagle" and " Ara," 1921-28 185 



fingers, or is equal in length to the merus; in young males and in 

 females this spine, though long, is less produced than in old males. 

 The propodus, including the fingers, is one-fourth longer than the 

 merus, the fingers being slightly more than one-third of this length. 

 The lateral margins are carinate and there is a beaded line below the 

 upper margin and two more prominent beaded lines which are 

 obliquely median. The fingers are slender, tapering, each with two 

 carinae on the outer face, the cutting edge dentate, meeting. 



The ambulatories are very slender, the third pair the shortest, the 

 other two pairs being subequal. The carpus and propodus are car- 

 inate laterally, the dactyl long, acuminate, with a longitudinal groove, 

 the lateral margins heavily fringed. The natatory legs have the merus 

 and carpus stout, thick, the propodus and carpus broadly laminate. 



Synonymy. — Achelous spinicarpus Stimpson, Bull. Mus. Comp. Zool., 

 vol. 2, p. 149, 1870-1871. 



Neptunus (Hellanus) spinicarpus A. Milne Edwards, Miss. Sci. Mex- 

 ico, tome V, p. 221, pi. 40, fig. 1, 1879 ; Bull. Mus. Comp. Zool., 

 vol. 8, p. 11. — A. Milne Edwards and Bouvier, Mem. Mus. Comp. 

 Zool., vol. 47, p. 312, 1923. 



Portunus spinicarpus Kathbun, Amer. Nat., vol. 34, p. 142, 1900. 



Portunus (Achelous) spinicarpus Bathbun, Bull. Labr. Nat. Hist. 

 State Univ. Iowa, vol. 4, p. 276, 1898 ; Bull. U. S. Fish. Comm., 

 vol. 20, part 2, p. 47, 1901. 



Portunus (Achelous) depressifrons (Stimpson). 



Plate 63. 



Diagnostic characters : Lateral spine but little longer than those 

 anterior to it ; front not prominent, four subequal, frontal teeth ; orbi- 

 tal tooth broad but not bifid. A curious mask-like figure formed by 

 areolations on the dorsal surface of the carapace. Chelipeds with a 

 single distal spine on the hand. 



Type: Stimpson founded the species on material "found on the 

 coast of South Carolina, by Captain Kurtz, and there are specimens 

 from the Florida Keys in the Smithsonian Museum." 



Distribution : Known from Cape Hatteras, N. C, to the Antilles. 



Material examined : One small male, Cardenas, Cuba, taken by the 

 ^'Ara," William K. Vanderbilt, commanding. 



