THE CANCROID CRABS OF AMERICA 43 



Description. — A small species. Carapace about twice as wide as 

 long, not very uneven, covered with fine depressed granules; the long 

 branchial and the two gastric ridges low, the cardiac region with a 

 median furrow. Of the four triangular and blunt frontal teeth the 

 median are very small, much smaller than the outer ones, which are 

 more advanced than the outer and inner supraorbital teeth. This 

 last tooth is oblique with an obtusangular projection, scarcely a tooth, 

 on its outer slope. Antero-lateral teeth 2 to 8 are very small, spine- 

 tipped, similar, the first four directed forward, the last three narrower 

 at base and directed more outward. Lateral spine as long as the 

 space occupied by the 3 adjacent spines and directed outward or 

 slightly backward. 



The 4 or 5 teeth of the inner margin of the arm are slender and dis- 

 tant; a terminal spine on the outer margin. Two spines on carpus, 

 the inner somewhat larger than the outer. Three spines on palm, 

 two of which are on the upper margin, terminal and subterminal or 

 at the distal fifth; 5 carinae on upper and outer surfaces. Postero- 

 distal margin of merus of swimming-leg oblique, unarmed. 



Color. — Grayish yellow with marblings or spots of yellowish, 

 white and blackish; inner face of chelipeds reddish. (Desbonne.) 



Measurements. — Male (15227), total length of carapace 14.1, 

 width of same 26.3, width at base of lateral spine 21.7, fronto-orbital 

 width 12.6, width of front 3.8 mm. 



Habitat.— IAyq^ on sandy shores where it ordinarily buries in the 

 sand. (Desbonne.) 



Range. — North Carolina to Brazil; Bermudas. 



Material examined. — See table, pages 44-46. 



PORTUNUS (PORTUNUS) VENTRALIS (A. Milne Edwards) 



Plate 13, Figures 1 and 2 



Neptunus ventralis A. Milne Edwards, Crust. Reg. Mex., 1879, p. 215, pi. 40, 



fig. 3-36 (type-locality, Guadeloupe; type in Paris Mus.). Not Portunus 



ventralis Rathbun, 1901. 

 Portunus sulcatus Rathbun, Bull. U. S. Fish Comm. for 1900, vol. 2, 1901, p. 45 



(not Neptunus sulcatus A. Milne Edwards). 

 Portunus (Portunus) sulcatus Rathbun, Univ. Iowa Studies Nat. Hist., vol. 9, 



1921, p. 67. 



Diagnosis. — No spine at extremity of outer margin of arm. A 

 spine at distal third of upper margin of palm. Four teeth of front 

 about equally advanced. 



Description. — Akin to anceps. Carapace short pubescent, gran- 

 ulation coarse and extensive forming an elaborate pattern. Frontal 

 teeth of median pair smaller than those next but nearly or in small 

 specimens quite as advanced; they are not triangular but almost 

 semicircular or with arcuate edge; outer teeth subtriangular with blunt, 



