THE GBAPSOID CRABS OF AMEBICA. 361 



Maria Cleofa, Tres Marias Islands, Mexico; May 30, 1897; Nelson 

 and Goldman, Biological Survey, U. S. Dept. Agriculture; 1 male 

 (20G50). 



San Benedict Island, Revilla Gigedo Islands, Mexico; A. W. 

 Anthony; 1 male, 1 female (20G90), 1 male (20G97). 



Socorro Island, Eevilla Gigedo Islands, Mexico; A. "W. Anthony; 

 2 males (20G91). 



Acapulco, Mexico (M. C. Z.). 



Clipperton Island, North Pacific Ocean, west of Costa Rica; J. S. 

 Arnheim; 1 male, 1 female (19G4G). 



Malpelo Island, off Bay of Panama; Albatross; 1 male, holotype 

 of G. malpilensis (4492, M. C. Z.). 



GECARCINUS LAGOSTOMA Milne Edward*. 



Plates 125 and 12G. 



Gecarcinus lagostoma MILNE EDWARDS, in Freminville, Ann. Sci. Nat., ser. 2, 

 vol. 3, 1835, p. 218, footnote; Mauritius (nom.cn nudum) \ Hist. Nat. 

 Crust., vol. 2, 1S37, p. 27 (type-locality, Australasia; 1 type In Paris 

 Mus.). STEMMING, Hist. Crustacea, 1893. p. 84, pi. 2. 



Gecarcinus ruricola GKKEFF, Sitzsungsb. Ges. Marburg, 1882, p. 26; not G. 

 ruricola (Linnaeus). Osouio, .Jor. Sci. Lisbon, ser. 2, vol. 5, 1898, pp. 

 185 and 192; not G. ruricola (Linnaeus). 

 Gecarcinns Inyostoma (?) MIEKS, Challenger Kept, Zool., vol. 17, 1S8G, 



p. 218, pi. 18, figs- 2-2c. 



Diagnosis. Large. Maxillipeds cover epistome and antennular 

 cavities; merus suboval, with an antero-internal fissure. Chelipeds 

 subequal. Dactyli of legs with six 

 rows of spines. 



Description. The dorsal aspect of 

 the carapace is much like that of G. 

 ruricola. The fronto-orbital distance 

 is in the adult male throe-eighths, in 

 the half grown male less than half, the 

 entire width of the carapace; the front 

 is wider and the orbits narrower than 



. -, r^ >^ i i * t *i i <- Fl - 1C- *- GECARCIXDS LAGOS- 



m ruricola. The height of the orbit is TOMA OUTEK M A x , L L , ,. E , 



about three-fourths of its width. ASCENSION ISLAND, SMOUTLY 



rr>1 !! 1 1 J.1 BEOIX'ED. fl, Ul'I'Ell VIEW; 6, 



The outer maxillipeds touch the LOWEU VIEW ' (A , TEB MlEUS } 

 front, fitting snugly over the anten- 

 nular cavities; they are narrower, and at the middle project less 

 outwardly than in ruricola] the merus is rounded at the end as in 

 that species, but on the antero-internal edge has a deep fissure, closed 

 by the overlapping of the proximal edge of the slit on the distal edge. 



>Bouvier (Bull. Mus. Hist. Nat. Paris, 100G, p. 498) considers this locality erroneous. 



