Boone, Crustacea, Cruise of ''Alva," 1931 179 



Material examined: Six males and three females, ovigerous, col- 

 lected in Tagus Cove, Albemarle Island, Galapagos Islands, July 29, 

 1931, One small female taken at Apia, Samoa, September 5, 1931. 

 One small male and one medium size female, taken on the rocks, at 

 Anaho Bay, Nuka Hiva, Marquesas Islands, August, 1931. 



Discussion: The specimens taken in the Galapagos by the ''Alva" 

 are identical with those secured by the " Ara," the "Arcturus" and 

 the "Nourmahal" in this same Archipelago and by the "Pawnee" in 

 the Pearl Islands and the Gulf of Lower California. It is quite inter- 

 esting to note that one of the large males of the present series is a 

 * * pealer, ' ' the new soft shell showing the perfection of detail character- 

 istic of the species, where the hard shell has been accidentally broken 

 off. 



The three IndoPacific specimens of the present series afford an in- 

 teresting commentary on the variation due to age. The two small 

 specimens, male and female, are identical with many Galapagan and 

 West Indian specimens that I have examined in the collections of the 

 Beebe, Bingham, Astor and Vanderbilt expeditions. The third speci- 

 men, a medium size female from Nuka Hiva Island, Marquesas, shows 

 in moderate degree the more acute carpal spine, which is considered 

 by some writers to be a valid character of the closely related species, 

 G. tenuicrustatus (Herbst). 



References : Cancer grapsus Linne^ Syst. Nat. ed. X, vol. 1, p. 630, 

 1758. 



Grapsus grapsus Alcock, Journ. Asiatic Soc. Bengal, vol. 69, pt. 2, p. 

 393, 1900. With full synonymy of Indo-Pacific records. — Boone, 

 Bull. Vanderbilt Marine Museum, vol. II, p. 203, pi. 69, 1930 ; with 

 description, illustration, American distribution and recent syn- 

 onymy. — Eathbun, M. J., U. S. Dept. Agric. N. Amer, Fauna, no. 



14, p. 74, 1899.— Lenz, Ahb. Senkenb. Naturf. Ges. Bd. 27, p. 368, 

 1905. — NoBiLi, G., Ann. Mus. Nat. Hist. ser. 9, Zool. t. IV, p. 319, 

 1906 ; NoBiLi, Bull. Sci. France-Belg., t. 40, p. 550, 1906 ; Torino 

 Mem. Acad. Sci. ser. 2, vol. 57, p. 414, 1907. — Bryan, Occas. 

 Papers B. F. Bishop Mus. vol. II, p. 119, 1903-1907.— Balss, H., 

 Ergeb. Zweiten. Deutsch. Zentral Afrik. Exped., 1910-1911; Bd. 

 I, Zool., p. 105, 1913-1917 ; Denksch. Akad. Wiss. Wien, Bd. 99, p. 



15, 1924. 



