No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 479 



Measurements. — Largest specimen, female: length 20.0 mm, width 

 33.2 mm, cheliped 31.0 mm, chela 20.0 mm, dactyl 10.0 mm. 



Color in life. — Cardiac and intestinal regions pansy purple, blending 

 into a dusky aricula purple on other areas. Grooves between areolations 

 white, with only a little of the color of the adjoining areas. Chelipeds 

 dark pansy purple to middle of fingers. Fingers banded with light taupe 

 brown, lighter toward tips. Ambulatory legs light pansy purple, dactyl 

 lighter, nail yellow. (Petersen) 



Habitat. — In crevices between large boulders, where they may be 

 found by removing loose pebbles. 



Depth. — Shore. 



Remarks. — This species is not nearly so abundant or so continuously 

 distributed as the following O. tenuidactylus (Lockington). Small 

 colonies adhere closely to a few favorable localities, as at James Bay, 

 where about 40 were removed in a few minutes from a single moist pocket 

 filled with smooth, round pebbles. 



Ozius tenuidactylus (Lockington) 

 Plate 81, Fig. 1 



Xantho tenuidactylos Lockington, Proc. Calif. Acad. Sci., vol. 7, pt. 1, 



p. 98, 1877. 

 Ozius tenuidactylos Glassell, Trans. San Diego Soc. Nat. Hist., vol. 8, 



no. 14, p. 104, 1935. 

 Ozius tenuidactylus Schmitt, Smithsonian Misc. Col., vol. 98, no. 6, p 25, 



1939. 

 Ozius agassizii A. Milne Edwards, Crust. Reg. Mex., p. 279, pi. 55, figs. 

 1-ld, 1880. Rathbun, Proc. U.S. Nat. Mus., vol. 21, p. 583, 1898; 

 Bull. 152, U.S. Nat. Mus., p. 544, pi. 221, figs. 3 and 4, 1930. 

 Boone, Zoologica, vol. 8, no. 4, p. 225, fig. 83, 1927. Sivertsen, Med. 

 fra det Zool. Mus., Oslo, nr. 38, p. 17, 1933. 

 Type locality. — Unknown; one of Lockington's. 

 Type. — Not extant. 



Range. — From the Gulf of California (Lockington) to Ecuador 

 (Nobili) ; Galapagos Islands (Hassler Expedition). 



Diagnosis. — Carapace much more than one and one-half times wider 

 than long. Anterolateral and posterolateral margins nearly straight, meet- 

 ing in two rounded lobes at lateral angles. Chelipeds dissimilar, dactyls 

 of minor chela extremely attenuated. 



Material examined (1,224 specimens from 49 stations) . — 

 11-32. Conway Bay, Indefatigable Island, shore, Jan. 12-14, 1932, 

 2 young. 



