16 



BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



BOTTOM, Joiirn. Roy. Micr. Soc, 1918, p. 127. — Cushman, U. S. Nat. Mus. 

 Bull. 100, vo) 4, p. 132, pi. 27, fig. 2, 1921; Carnegie Inst. Washington, 

 Publ. 342, p. 1l pi. 6, figs. 1, 2, 1924; Cushman Lab. Foram. Res. Special 

 Publ. No. 9, p. 1 7, pi. 16, figs. 18-20, 1937. 



Test broad, muc^ compressed, usually completely surrounded 

 except at the aperture by a broad winglike flange, either entire or 

 variously lobed; chambers inflated somewhat; sutures very distinct, 

 slightly depressed; wall calcareous, with a few short, longitudinal 

 costae, usually confined to the limits of the chamber on which they 

 originate; aperture narrow, oval, with a single toothlike projection 

 in the orifice. Length, up to nearly 1.00 mm. 



This is a species originally described from the Indo-Pacific and 

 confined to that area so far as authentic material has been examined. 

 There are records for it from various Tertiary deposits, but the figures 

 accompanying the records do not seem to belong to this very definite 

 species. In our Recent collections the species has occurred almost 

 entirely at Albatross stations, as will be noted in table 6. There are 

 two distinct forms, one very broad and with distinct transparent keels 

 about the periphery especially of the later chamber, the other form 

 somewhat narrower and with the keels eithfer wanting or greatly 

 reduced. In both forms the characteristic costae are present but 

 variable in number and strength. The only shallow-water station 

 from which we had material is Viva Anchorage, Fiji, in 3 fathoms. 



Table 6. — Bolivina hantkeniana — material examined 



BOLIVINA SPINEA Cushman 



Plate 6, Figure 1 



Bolivina spinea Cushman, Cushman Lab. Foram. Res. Special Publ. No. 6, p. 58, 

 pi. 8, figs. 11a, b, 1936; No. 9, p. 131, pi. 16, fig. 26, 1937. 



Test less than twice as long as broad, rapidly tapering, greatest 

 breadth made by the last paar of chambers, initial end acute, with a 

 large, stout spine, periphery in end view broadly rounded, almost 

 truncate; chambers distinct, somewhat inflated, about twice as broad 



