No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 421 



Remarks. — While P. (A.) angustus was taken in a number of the 

 same dredge hauls as F. (A.) stanfordi Rathbun (1898), none of the 

 former were encountered at depths greater than 55 fms, while the latter 

 was dredged six times at depths of over 55 fms to depths as great as 

 150 fms. 



The reduction in size of the alternate anterolateral spines, suggestive 

 of the genus Cronius, is diagnostic of the species, together with the 

 smooth, flat carapace and the short lateral spine. 



Portunus (Achelous) tuberculatus (Stimpson) 

 Plate 71, Fig. 2 



Achelous tuberculatus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 



7, p. 223 (95), 1860. 

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

 21, p. 596, 1898; Bull. 152, U.S. Nat. Mus., p. 90, pi. 44, and 

 synonymy, 1930. Finnegan, Journ. Linn. Soc. London, vol. 37, p. 

 629, 1931. Crane, Zoologica, vol. 22, no. 3, p. 68, 1937. 

 Type locality. — Cape San Lucas, Lower California. 

 Types.— Cotypes in Brit. Mus., MCZ, and USNM, No. 19679. 

 Range. — From Cape San Lucas (Xantus) to Panama (Albatross); 

 Gorgona Island, Colombia (Crossland) ; 3-29 fms (Crane). 



Diagnosis. — Carapace with many tubercles, a spine at posterior angles. 

 Lateral spine exceedingly long, not at all forward directed. No spine at 

 posterodistal angle of merus of fourth leg. 



Material examined (5 specimens from 4 stations). — 

 66a-33. Tagus Cove, Albemarle Island, "roach" trap, attached to fish 



trap, Feb. 9, 1933, 1 young. 

 87-33. South Seymour Island, 15 fms, Feb. 19, 1933, 1 ovig. female 

 (photographed). 

 783-38. Darwin Bay, Tower Island, 40-70 fms, Jan. 16, 1938, 1 ovig. 



female. 

 785-38. Darwin Bay, Tower Island, 20-40 fms, Jan. 17, 1938, 1 male, 

 1 female. 

 Measurements. — Ovigerous female: length 7.9 mm, width including 

 lateral spines 16.6 mm, cheliped 16.0 mm, chela 7.5 mm, dactyl 4.2 mm. 

 Habitat. — White sand, sand and rock, sand and coral. 

 Depth. — 3-70 fms. 



