494 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



784-38. Darwin Bay, Tower Island, shore, Jan. 17, 1938, 4 males, 5 



females (2 ovig.). 

 789-38. South Seymour Island, shore, Jan. 19, 1938, 4 males, 1 ovig. 



female. 

 800-38. Cartago Bay, Albemarle Island, Jan. 22, 1938, 1 male. 

 811-38. Barrington Island, coral, Jan. 26, 1938, 28 males, 30 females 

 (21 ovig.). 

 Measurements. — A large female: length 10.8 mm, width 13.5 mm, 

 cheliped 18.0 mm, chela 12.8 mm, dactyl 7.3 mm. 

 Color in life. — Brown and yellow. 

 Habitat. — The Pocillopora coral colony. 

 Depth. — Shore. 



Remarks. — This brown and yellow Trapezia occurs with the red T. 

 cymodoce ferruginea Latreille in the proportion of 1 : 3. In separating so 

 many hundreds, the color alone was relied upon, although there are other 

 important differences, as given in the diagnoses. The front of T. digitalis 

 is finely denticulate, as compared to the shallow frontal lobes of T. c. fer- 

 ruginea, and there is no lateral tooth. 



T. digitalis is now recorded from the Galapagos Islands. 



Genus QUADRELLA Dana, 1851 



Quadrella nitida Smith 



Plate 80, Fig. 6 



Quadrella nitida Smith, Proc. Boston Soc. Nat. Hist., vol. 12, p. 288, 

 1869. Rathbun, Bull. 152, U.S. Nat. Mus., p. 561, pi. 229, and 

 synonymy, 1930. Crane, Zoologica, vol. 22, no. 3, p. 74, 1937. 

 Type locality. — Pacheca, Perlas Islands, Panama. 

 Type. — In Peabody Mus., Yale Univ. 



Range. — Lower California (Stimpson) to Panama (Bradley); 6-75 

 fms. (Crane) 



Diagnosis. — Carapace hexagonal, convex, smooth, regions not indi- 

 cated. Front cut into 4 spines, median notch deepest. Merus of cheliped 

 stout, projecting beyond carapace and armed with 6 to 8 spines. Carpus 

 with an inner tooth. Hand exceeding width of carapace, fingers long and 

 incurved. 



Material examined. — 

 311-35. Marchena Island, 20 fms, Dec. 3, 1934, 1 young (photo- 

 graphed). 

 Measurements. — Young specimen : length 3.4 mm, width 3.5 mm. 



