392 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Diagnosis. — Carapace smooth, depressed, broadly oval. Frontal lobes 

 subtruncate, separated by a distinct V. Two rows of lateral marginal 

 spines. Eyes prominent, a minute preocular spine. Basal antennal article 

 broad, marginal teeth 2, flagellum half as long as carapace. 



Material examined. — None from the Galapagos Islands. Hancock 

 collections contain specimens from Bahia Honda, Panama, to La Plata 

 Island, Ecuador. 



Subgenus Mithraculus 



Mithrax (Mithraculus) nodosus Bell 



Plate 68, Fig. 1 



Mithrax nodosus Bell, Proc. Zool. Soc. London, vol. 3, p. 171, 1835 

 (1836; Trans. Zool. Soc. London, vol. 2, p. 53, pi. 11, figs. 1-lb, 

 1836. 

 Mithrax (Mithraculus) nodosus Rathbun, Bull. 129, U.S. Nat. Mus., 

 p. 429, pi. 155, and synonymy, 1925. Boone, Zoologica, vol. 8, no. 4, 

 p. 158, fig. 50, 1927. Finnegan, Journ. Linn. Soc. London, vol. 37, 

 p. 625, 1931. Sivertsen, Med. fra det Zool. Mus., Oslo, nr. 38, p. 12, 

 1933. Hult, Arkiv for Zoologi, Band 30A, no. 5, p. 12, 1938. 

 Schmitt, Smithsonian Misc. Col., vol. 98, no. 6, p. 25, 1939. 

 Type locality. — Galapagos Islands. 

 Type. — Not extant. 



Range. — Galapagos Islands (Bell) ; Chile (Miers). 

 Diagnosis. — Carapace with smooth, oblique, branchial furrows. Three 

 large anterolateral lobes. Inner margin of cheliped laminated. 

 Material examined (850 specimens from 57 stations). — 

 11-32. Conway Bay, Indefatigable Island, Jan. 12, 1932, 1 male. 

 24-33. Gardner Bay, Hood Island, shore, Jan. 24, 1933, 15 males. 

 27-33. Gardner Bay, Hood Island, shore, Jan. 25, 1933, 20 males, 16 



females (6 ovig.). 

 30-33. Gardner Bay, Hood Island, shore, Jan. 26, 1933, 11 males, 



20 females (15 ovig.). 

 33-33. Black Beach, Charles Island, shore, Jan. 27, 1933, 11 males, 



6 females (4 ovig.). 



38-33. SE of Cormorant Point, Charles Island, shore, Jan. 29, 1933, 



7 males, 6 females (2 ovig.). 



42-33. Opposite Kicker Rock, Chatham Island, shore, Jan. 31, 1933, 



3 males, 7 females (5 ovig.). 

 48-33. Barrington Island, shore, Feb. 2, 1933, 7 males, 9 females (1 



ovig.). 



