Boone, Crustacea, Cruises of "Ara" and "Alva" 239 



the base of the fingers. The fingers are each nearly as long as the 

 palm, fluted, distally tapered, each with a coarse molar and five 

 or six coarse triangular teeth. The female chelipeds are much 

 smaller than those of the male and are subequal. 



The ambulatory legs are very long, decreasing in the order: 

 2 equals 3, 1, 4, with the merus, carpus and propodus laterally 

 compressed, the latter two articles with two or three longitudinal 

 lines of coarse punctae on the outer faces ; the dactyli are strong, 

 0.9 as long as the propodi, laterally compressed, distally tapered, 

 fluted longitudinally and very acuminate. 



References: Geryon quinquedens, Smith, S. I., Trans. Conn. 

 Acad. Arts and Sci., 1879, vol. V, p. 35, pi. 9, figs. 1-la. — 

 BouviER, E. L., Res. Campagn. Sci. Monaco, 1922, Fasc. 

 LXII, p. 70, pi. 6, fig. 7.— Rathbun, M. J., Bull. CXVI, U. S. 

 Nat. Mus., 1937, p. 271, pis. 85, 86. 



Geryon paulen^is, Doflein, F., Exp. "Valdivia," Brachyura, 

 1904, p. 112, pi. 31, figs. 31 and 32. 



Family: GRAPSIDAE 



Subfamily: Grapsinae 



Genus: GRAPSUS Lamarck 



Grapsus grapsus Linne 



■f 



Volume II, plate 69 ; Volume V, plate 90 



Material examined : Four females and two males, of small 

 and medium size, taken at Jebwar, Jaluit Island, Marshall 

 Islands, December 30, 1928, by the "Ara" World Cruise. 



Discussion: Again the scarlet Grapsus grapsus is recorded 

 in the Vanderbilt collections, the present series apparently estab- 

 lishing the first record of its occurrence in the Marshall Islands. 

 The specimens, which are of medium and small size, are identical 

 in diagnostic characters with the several hundred previously ex- 

 amined by the writer from various, widely scattered localities in 

 the tropicopolitan regions this species inhabits. It has been com- 

 pletely described with illustrations in Volume II, Bulletin of the 

 Vanderbilt Marine Museum, 1930, p. 203, plate 69, also Ibid, 

 Volume V, 1934, p. 178, plate 90. 



