No. 10 garth: brachyuran fauna of the galapagos 425 



Tj;;^^.— AHFno. 371. 



Range. — From Angel de la Guardia Island, Gulf of California, to 

 Secas Islands, Panama (Velero III) ; Galapagos Islands (Velero III). 



Diagnosis. — Front bilobed, subtruncate; lobes arched. Carapace one 

 and one-third times as broad as long. Anterolateral margin greatly ex- 

 ceeding posterolateral margin. Orbits reduced to slits dorsally ; eyes small. 

 Fingers of nearly equal length, gaping in a broad oval. First segment of 

 palpus of third maxilliped inflated and horizontally compressed. Margins 

 of carapace and legs fringed with long, cjdindrical, golden hairs. 

 Material examined (10 specimens from 8 stations). — 

 46-33. Barrington Island, 4-10 fms, Feb. 2, 1933, 1 young. 

 66-33. Tagus Cove, Albemarle Island, 10-20 fms, Feb. 9, 1933, 1 



male. 

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



young. 

 177-34. Sulivan Bay, James Island, 5-20 fms, Jan. 23, 1934, 1 female. 

 187-34. Cartago Bay, Albemarle Island, 8-10 fms, Jan. 25, 1934, 1 



young. 

 193-34. Post OflSce Bay, Charles Island, 8-10 fms, Jan. 27, 1934, 1 



young. 

 204-34. Gardner Bay, Hood Island, 30 fms, Jan. 31, 1934, 2 males. 

 795-38. Sulivan Bay, James Island, 35-40 fms, Jan. 21, 1938, 1 male, 

 1 female. 

 Measurements. — Male holotype: length of carapace 10.9 mm, width 

 14.7 mm, of front 6.3 mm, chela 8.3 mm, manus 5.0 mm, movable finger 

 6.3 mm, immovable finger 3.7 mm, height of gape 2.3 mm. 



Color in life. — From Gulf of California specimen: carapace pale 

 apricot orange, a triangular red space on branchial region. Chelae pale 

 cream color with a few touches of red. Fingers light bone brown, fading 

 on tips. Ambulatory legs light cream buff, semitransparent, and with a 

 few touches of bright red. Ventral side clear white. (Petersen) 

 Habitat. — On clean white sand. 

 Depth. — 4-40 fms. 



Remarks. — Because both are white and hairy, Kraussia americana 

 may be confused with Acidops fimbriatus Stimpson, of the family Xanthi- 

 dae. The minute orbits of the former, contrasted with the long eye stalks 

 of the latter, and the peculiar, curved fingers of Kraussia with their im- 

 bedded brushes of hair serve readily to distinguish one from the other. 



The existence of Kraussia, an Old World genus, in the Galapagos 

 Islands, along with Maldivia, Daldorfia, and others, indicates a trans- 

 pacific origin of a proportion of the Galapagos crustacean fauna which 

 will undoubtedly increase as exploration continues. 



