No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 445 



Depth. — Shore to 73 fms. 



Remarks. — Although referred by Rathbun (1930) to the genus 

 Medaeus because of certain structural peculiarities, the appearance of this 

 crab is that of a Pilumnus. 



Genus GYGLOXANTHOPS Rathbun, 1897 



Gycloxanthops vittatus (Stimpson) 



Plate 79, Fig. 5 



Xantho vittata Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, p. 206 



(78), 1860. 

 Cycloxanthops vittatus Rathbun, Mem. Mus. Comp. ZooL, vol. 35, p. 

 70, 1907; Bull. 152, U.S. Nat. Mus., p. 291, pi. 133, figs. 3 and 4; 

 pi. 134, fig. 3, 1930. Boone, Zoologica, vol. 8, no. 4, p. 197, fig. 68, 

 1927. Sivertsen, Med. fra det Zool. Mus., Oslo, nr. 38, p. 15, 1933. 

 Type locality. — Panama and Cape San Lucas. 

 Types. — Cotypes from Cape San Lucas in MCZ, No. 1260. 

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

 Galapagos Islands (Arcturus). 



Diagnosis. — Front advanced, truncate, separated from orbit by a 

 notch. Carapace narrow, anterolateral margins arcuate, broken into 9 

 sharp teeth. A denticle on inner slope of orbit. 



Material examined (44 specimens from 21 stations). — 

 27-33. Gardner Bay, Hood Island, shore, Jan. 25, 1933, 2 males. 

 33-33. Black Beach, Charles Island, shore, Jan. 27, 1933, 1 large 



female. 

 73-33. Cartago Bay, Albemarle Island, shore, Feb. 13, 1933, 1 male, 



1 female. 



76-33. Cartago Bay, Albemarle Island, shore, Feb. 14, 1933, 1 male. 



80-33. Duncan Island, coral, Feb. 15, 1933, 1 young. 



98-33. Darwin Bay, Tower Island, shore, Feb. 25, 1933, 1 male, 1 



ovig. female. 

 154-34. Reef north of Tagus Hill, Albemarle Island, reef, Jan. 15, 



1934, 1 female. 

 166-34. Black Beach, Charles Island, shore, Jan. 19, 1934, 1 female. 

 167-34. Post Office Bay, Charles Island, 15 fms, Jan. 19, 1934, 1 male. 

 202-34. Gardner Bay, Hood Island, shore, Jan. 31, 1934, 2 males. 

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



2 females. 



314-35. Academy Bay, Indefatigable Island, shore, Dec. 7, 1934, 2 

 specimens. 



