No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 517 



Uca helleri Rathbun 

 Plate 87, Figs. 5, 6 



Uca helleri Rathbun, Proc. Washington Acad. Sci., vol. 4, p. 277, pi. 12, 



figs. 3 and 4, 1902; Bull. 97, U.S. Nat. Mus., p. 415, pi. 151, text 



fig. 170a and b, 1918. Boone, Zoologica, vol. 8, no. 4, p. 278, fig. 98, 



1927. Crane, Zoologica, vol. 26, no. 19, p. 198, text figs. 4R, 5, 1941. 



Type locality. — Mangrove Point, Narborough Island, Galapagos 



Islands. 



Type.—\]?>NM. No. 24829. 



Range. — Albemarle, Narborough, and Tower Islands, Galapagos 

 Islands. 



Diagnosis. — Superior margin of palm without granular ridge. Orbital 

 margins strongly oblique. Front less than one-third width of carapace. 

 Size small. 



Material examined (225 specimens from 5 stations). — 

 52-33. Academy Bay, Indefatigable Island, shore, Feb. 4, 1933, 14 



males, 11 females (2ovig.). 

 62-33. Black Bight, Albemarle Island, shore, Feb. 8, 1933, 63 males, 



38 females (4 ovig.), (including photographed pair). 

 93-33. Darwin Bay, Tower Island, shore, Feb. 22, 1933, 50 males, 



43 females (3 ovig.). 

 98-33. Darwin Bay, Tower Island, shore, Feb. 25, 1933, 4 males, 



1 female. 

 153-34. Mangrove Point, Narborough Island, shore, Jan. 14, 1934, 1 

 male. 

 Measurements. — Large specimen, male: length 8.2 mm, width 12.3 

 mm, cheliped 32 mm, chela 21.4 mm, dactyl 15.5 mm; female: length 

 8.0 mm, width 11.0 mm. 



Habitat. — Sandy mud beneath mangrove roots. 

 Depth. — Shore. 



Remarks. — U. helleri and U. galapagensis Rathbun are found in 

 separate colonies and on separate islands except at Academy Bay, where 

 they occur in adjacent coves. The Academy Bay record is an extension of 

 range for U. helleri. 



