No. 10 garth: brachyuran fauna of the galapagos 419 



Depth. — 5-150 fms; also pelagic at night. 



Remarks. — All were dredged specimens except four which came to 

 the gangway light. P. (A.) Stanford! may be distinguished from P. (A.) 

 angustus Rathbun (1898) by the rough carapace and the strong lateral 

 spine, both unmistakable in even the smallest specimens. Hancock speci- 

 mens have been compared with the type (USNM No. 24833). 



The range of the species has been extended to include the northern- 

 most island, Wenman, and the known depth increased to 150 fms. 



Portunus (Achelous) angustus Rathbun 

 Plate 71, Figs. 3, 4 



Portunus (Achelous) angustus Rathbun, Proc. U.S. Nat. Mus., vol. 21, 

 p. 594, pi. 44, fig. 2, 1898; Proc. Washington Acad. Sci., vol. 4, p. 

 282, 1902; Bull. 152, U.S. Nat. Mus., p. 70, pi. 32, 1930. Finnegan, 

 Journ. Linn. Soc. London, vol. 37, p. 629, 1931. 

 Type locality. — Off Hood Island, Galapagos Islands, 20 fms. 

 Type.—USNM No. 21587. 



Range. — Hood Island (Albatross) and Tagus Cove, Albemarle 

 Island (Hopkins-Stanford Expedition) ; known only from the Galapagos 

 Islands. 



Atlantic analogue. — P. ordwayi (Stimpson). 



Diagnosis. — Carapace flat and smooth, except for low transverse 

 granulate ridges. Lateral spine short, no larger than largest of antero- 

 lateral spines. A spine at the posterodistal angle of the merus of leg 4. 

 Anterolateral spines alternately large and small, as in Cronius, 

 Material examined (128 specimens from 31 stations). — 

 66-33. Tagus Cove, Albemarle Island, 10-20 fms, Feb. 9, 1933, 



fragments. 

 86-33. South Seymour Island, surface at light, Feb. 18, 1933, 2 



young. 

 87-33. South Seymour Island, 15 fms, Feb. 19, 1933, 2 young. 

 149-34. Tagus Cove, Albemarle Island, 20 fms, Jan. 13, 1934, 1 male. 

 157-34. Tagus Cove, Albemarle Island, 10-18 fms, Jan. 15, 1934, 2 



males. 

 167-34. Post Office Bay, Charles Island, 15 fms, Jan. 19, 1934, 5 



young. 

 168a-34. Academy Bay, Indefatigable Island, coral, Jan. 20, 1934, 1 



young. 

 169-34. Academy Bay, Indefatigable Island, 15-25 fms, Jan. 20, 1934, 

 11 young. 



