OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 



65 



Homola barhata White, List of the specimens of Crustacea in the collection of the 

 British Museum, p. 55, 1847. — S. I. Smith, Proc. U. S. Nat. Mus., vol. 3, 

 p. 420, 1880; Kept. U. S. Fish Comm. for 1885, p. 637 [33], pi. 2, fig. 1, 1886.— 

 Stebbing, South African Crustacea, pt. 2, p. 22 and synonymy, 1902. — 

 Hay and Shore, Bull. U. S. Bur. Fisheries, vol. 35 (1915-1916), p. 419, pi. 

 30, fig. 10, 1918. 



Diagnosis. — Carapace widest in anterior half. Rostrum bidentate. 

 Orbital spine distant from spine at base of rostrum. A tooth on 

 second segment of abdomen. 



Description. — Rostrum small, bidentate; upper orbital teeth larger 

 than those situated on either side of the bnse of rostrum and placed 



Figure 16.— Thelxiope barbata, male (19290). After Smith. 



on the same line. Gastric region rough with nine large spines, of 

 which one is median and posterior, four middle disposed in a square, 

 and two lateral on each side opposite middle of square and in nearly 

 a transverse line; lateral margins of carapace armed anteriorly with 

 a very large spine, situated at extremity of the suture which separates 

 the gastric and hepatic regions; a second spine shorter and slenderer, 

 a little farther back, followed by a series of small spinules; no spines 

 on rest of carapace. Arm prismatic, a row of spines on each margin; 

 hands a little compressed, spinous on lower border only. Ambula- 

 tory legs compressed; first three armed below with one row of small 



