GRAPSIDAE. By 
“I 
Cardisoma rotundum (Quoy and Gaimard). 
Thelphusa rotunda Quoy and Gaimard, in Freycinet’s Voyage autour du monde, 1825, 
Zool., 3, 527, pl. 77, fig. 1 (Thelphuse chaperon arrondi). 
Cardisoma hirtipes Dana, Proc. Acad. Nat. Sci. Phil., 1851, 5, 255; Crust. U. S. Expl. 
Exped., 1852, 1, 378; atlas, 1855, pl. 24, fig. 2. 
Cardiosoma hirtipes, Alcock, 1900, 69, 447. 
Cardisoma rotundum Safford, Contr. U. S. Nat. Herbarium, 1905, 9, 90. Rathbun, 
Bull. U.S. Fish. Comm. for 1905 (1906) part 3, 838. 
Niue ; Sept. 25, 1899; 1 @, juv. 
Besides the characters given by Alcock (loc. cif.) for distinguishing this 
species from the preceding, the following are very striking: — The width 
(transverse dimension) of the orbit is about # of the anterior width of the 
front, in C. rotundum,; the width of the orbit is greater than the anterior 
width of the front, in @ carnifex. The granulated line which marks the 
antero-lateral border of the carapace is not prolonged behind the level of the 
gastro-cardiac suture, in C. rotundum ; while the same line is prolonged far 
behind the suture, in C. carnifex. 
In the 3 females of C. rotundum which I have examined, the antero- 
lateral region of the carapace and also the chelipeds are much more roughly 
granulated than in the males. 
GRAPSIDAE. 
Grapsus grapsus tenuicrustatus (Herbst). 
Grapsus grapsus tenuicrustatus Rathbun, Bull. U.S. Fish Comm. for 1903 (1906), part 
3, 838, and synonymy. 
Mohegan Reef, Rangiroa Id., Paumotus; Sept. 21, 1879; 14,32 
Rangiroa Id. ; beach ; Sept. 21,1899; 1 ?. 
Fakarava, Paumotus; reef, sea beach; Oct. 13, 1899; 1 ¢. 
Makemo, Paumotus; Oct. 29,1899; 146,12. 
Grapsus strigosus (Herbst). 
Grapsus strigosus Alcock, 1900, 69, 395. 
Tongatabu, Friendly Islands; shore; Nov. 29, 1899; 2, ¢ and @ of small 
size. 
