No. 10 garth: brachyuran fauna of the galapagos 375 



A^ Carapace depressed, rostrum simple ; first ambulatory leg short- 

 est; tip of male abdomen rounded . . . D. depressus 



Dasygyius gibbosus (Bell) 



Microrynchus gibbosus Bell, Proc. Zool. Soc. London, vol. 3, p. 88, 1835 ; 



Trans. Zool. Soc. London, vol. 2, p. 41, pi. 8, figs. 1-lc, 1836. 

 Dasygyius gibbosus Rathbun, Proc. U.S. Nat. Mus., vol. 38, p. 571, 

 1910; Bull. 129, U.S. Nat. Mus., p. 138, pi. 274, figs. 1-4, 1925. 



Type locality. — Galapagos Islands, 6 fms, sandy mud. 



Type. — Not extant. 



Range. — Known only from the Galapagos Islands (Bell). 



Diagnosis. — Carapace subglobular, coarsely granulate, rostrum bifid. 

 Male chelae moderately inflated, dactyl w^ith a large basal tooth. Legs 

 long, cylindrical, hairy, first leg not appreciably shorter than second. Tip 

 of male abdomen narrowly triangular. 



Material examined. — None. 



Remarks. — See Remarks under the following D. depressus. 



Dasygyius depressus (Bell) 



Microrynchus depressus Bell, Proc. Zool. Soc. London, vol. 3, p. 88, 

 1835; Trans. Zool. Soc. London, vol. 2, p. 42, pi. 8, figs. 2, 2d-f, 

 1836. 

 Dasygyius depressus Rathbun, Proc. U.S. Nat. Mus., vol. 21, p. 579, 

 1898; Bull. 129, U.S. Nat. Mus., p. 138, pi. 1; pi. 274, figs. 5-8, 

 1925. Crane, Zoologica, vol. 22, no. 3, p. 56, 1937. 



Type locality. — Galapagos Islands, 6 fms, sandy mud. 



Type. — Not extant. 



Range. — Gulf of California (Zaca) ; Galapagos Islands (Bell) ; 6- 

 60 fms (Crane). 



Diagnosis. — Carapace depressed, finely granulate, rostrum simple. 

 Chelae of male turgid, dactyl without large basal tooth. Legs long, cylin- 

 drical, hairy, first ambulatory shortest. A large conical spine on male first 

 abdominal segment. 



Material examined. — None from the Galapagos Islands. 



Remarks. — The Hancock collections contain a long series of specimens 

 obtained along the mainland from Concepcion Bay, Gulf of California, 

 to Port Utria, Colombia. All were dredged from mud of a type which 

 was not found in the Galapagos Islands, as there are no rivers, with the 

 exception of the small stream at Freshwater Bay, to provide a bottom rich 

 in detritus. Since D. depressus has not been taken in Galapagos waters in 



