210 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Holotype (AHF no. 43) from Station 208. 



This species is a small one but keeps its characters with little variation. 

 It differs from Bolivina paula Cushman and Cahill in the much less com- 

 pressed test, sutures at nearly right angles to the elongate axis and broadly 

 rounded periphery. 



Stations: 73, 80, 106, 110, 144, 208, 209, 226, 227, 271, 1005, 1018, 

 1076, 1081, 2107, 2110, 2112, 2113, 2114, 2116, 2156. 



Type locality. — Melpomene Cove, south end of Guadalupe Island, in 

 18 fms. 



Distribution. — Off the Channel Islands in 8 to 180 fms.; southward 

 along Mexico and into the Gulf of California in 13 to 225 fms. 



Bolivina seminuda Cushman 

 Plate 25, Fig. 14 



Bolivina seminuda Cushman, Bull. 71, U.S. Nat. Mus., pt. 2, 1911, 

 p. 34, text fig. 55 ; Contr. Cushman Lab. Foram. Res., vol. 2, pt. 2, 1926, 

 p. 43; Bull. Scripps Instit. Oceanography, Tech. Sen, vol. 1, 1927, p. 

 157, pi. 3, fig. 6. — Hada, Trans. Sapporo Nat. Hist. Soc, vol. 11, 1929, 

 p. 11. — Cushman and Moyer, Contr. Cushman Lab. Foram. Res., vol. 6, 



1930, p. 57. — Hada, Sci. Rep't Tohoku Imp. Univ., sen 4, Biol., vol. 6, 



1931, p. 132, text fig. 89.— Cushman, Special Publ. 9, 1937, p. 142, pi. 

 18, figs. 13-15. 



Test elongate, 3 to 4 times as long as broad, subcylindrical, very 

 slightly compressed, increasing slightly in width, peripheiy very broadly 

 rounded; chambers numerous, distinct, very slightly inflated, the earlier 

 ones broader than high, but in the adult becoming higher than broad; 

 sutures distinct, depressed, forming an angle of less than 45° with the 

 horizontal ; wall of the upper portion of each chamber clear and hyaline, 

 the lower half with rather coarse foramina, giving a whitish appearance 

 to the lower half of the test in contrast to the clear upper portion ; aper- 

 ture elongate, oval. Length up to 1.00 mm.; breadth 0.30-0.35 mm.; 

 thickness 0.20-0.25 mm. 



The types are from Albatross D4775, Bowers Bank, Bering Sea, 584 

 fms. The species ranges southward along the Pacific Coast as far at least 

 as Panama, and westward across the Pacific to Japan, where it is recorded 

 by Hada from shallow water of Hokkaido and Mutsu Bay. It has been 

 found at three Albatross stations in the eastern Pacific. It occurs in the 

 Pliocene of California. 



