34 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



figured previously, but the early portion is entirely typical. In the 

 Albatross material it has occurred at station H3989, South Pass, 

 Likieb, K mile north, in 468 fathoms, and at H3978, Wotju Island, 

 Elmore Atoll, 6 miles southeast, in 1,068 fathoms. 



BOLIVINA LIGULARTA Schwager 



Plate 9, Figures 6, 7 



Bolivina ligularia Schwager, Novara-'Exped. Geol. Theil, vol. 2, p. 25, pi. 7, 

 fig. 102, 1866 — CusHMAN, Cushinan Lab. Foram. Res. Special Publ. No. 9, 

 p. 14, pi. 14, figs. 3-5, 1937. 



Test elongate, two or three times as long as broad, initial end 

 subacute, apertural end broadly rounded, sides of the adult nearly 

 parallel but slightly lobulate, compressed, periphery rounded; cham- 

 bers distinct, not inflated, about as high as broad; sutures distinct, 

 very slightly depressed, only slightly oblique; wall smooth, nearly 

 transparent; aperture broadly elliptical. Length of Recent specimen, 

 0.40 mm. 



This species was originally described by Schwager from the Pliocene 

 of Kar Nicobar. 



The Albatross material yields two specimens: U. S. N. M. No. 24811, 

 from station H3829, lat. 14° 56' 00" S., long. 148° 48' 00" W., 860 

 fathoms, wh. co. s. glob. vol. part.; and U.S.N.M. No. 24813, from 

 station H3900, midway between Hikueru and Marokau, l,372fathoms, 

 35.7°F., glob. oz. 



Genus LOXOSTOMA Ehrenberg, 1854 



Loxostomum Ehrenberg, Mikrogeologie, pi. 27, fig. 19, 1854. — Cushman, Cush- 



man Lab. Foram. Res. Special Publ. No. 1, p. 252, 1928. 

 Loxostoma Howe, Journ. Pal., vol. 4, p. 329, 1930. 

 Proroporus (part) of authors (not Ehrenberg, 1854). 

 Bolivina (part) of authors. 



Genotype. — By designation, Loxostomum subrostratum Ehrenberg. 



Test elongate, usually compressed, early portion often slightly 

 twisted; early chambers biserial with the aperture as in Bolivina at 

 the base of the apertural face, but m the adult tending to become 

 uniserial and the aperture failing to reach the base of the chamber, 

 finally becoming terminal. Cretaceous to Recent. 



This genus represents a further development from Bolivina, in 

 which the aperture becomes terminal at the same time that the 

 chambers become uniserial, a combination of the chambers seen in a 

 great many other groups of Foraminif era . 



There are a number of well-characterized species in the Pacific 

 material, some of which also exist in the West Indian region of the 

 Atlantic. 



