,M AKVI.ANI) (ii:()l,n(;i('.\|, SI ItVKV ?5o 



ilisliiiit: |i«'i-i|ilicr;il iii;ii'L:iii I'diiiid: <'liimil){'rs lai'«r(', iiillalcd; only i'ij.dit 

 ill liiial ciiiiv uliii ion ; septa nearly slrai^lil: apcrUirc median, an-hed. 

 Diameter. 0. l.'l-d.S'i mm. 



Tlioiiuli (leciirrim: in the ('I'etaeeons tlii' t'oi'm is nmre I'l'iMjnent ly re- 

 (•(M-(lei| ill Tertiary (le|insit>. (Iiiod recent specimens were secured by 

 tlu' Clialleii-er ill the North Atlantic at depths of 450 to 1000 fatlioms, 

 in the Si.iitli Atlantic at 430 to 1415 fathoms, in the South Pacific at 

 (ill) and -.'Kin ratliums. and in tlie Xorlli I'aeilic at 325 and 2050 fathoms. 



Orrurrriirc. — Ac^ii \ l'"()i;M A'lKix. 1 mile imrtliea.-t nf I'iscataway. 



( 'nllrcl inn. — Maryland ( iecloi^ieal Sui'vey. 



Genus I^UI.VINLII.INA I'aikcr iiiui Jniies. 

 PULYIXULIXA EXUiUA YAK. OliTUSA JjlUTOWS. 



Plate LXIV, Fig. 7. 



J'lthu/iKliiKi crujiiti, tun-, obtusa Burrows, ISUT, Proc. Geol. Assoc, (and reiiriut), vol. 

 XV, pts. i, ii (Marcli-Miiy.i, p. 49, pi. ii, tig. 25 in reprint. 



Descriplion. — "Test free, rotaliforin; hoth faces convex and generally 

 equally so; composed of three convolutions, of ^vhich the outermost has 

 usually five segments. Sutures non-limhate, marked on the superior 

 face by thickened lines of opaque shell-substance; on the inferior by 

 slight de])ressious; periphery obtuse, and very rarely lobulated."" Bur- 

 rows, 189;. 



According to the above author P. exigua var. obtusa is next to Biill- 

 mina elongaia the most common foraminifera of the Thanet Sands 

 (Lower Eocene). 



Our specimens agree closely Avitli the figure of Burrows' varieties of 

 PuIriiiiiVnia e.vi(/ua as figured by Professor Brady, but there are six in- 

 stead of five chambers in the final convolution and the form is not quite 

 so obtuse as the type forms. The perfectly straight septa so obliquely 

 set upon the superior surface are more distinct in the outer convolution. 

 Upon the inferior side these run straight to the center of the umbili- 

 cus. The type of the species (P. c.vigua) is regarded as a deep water 

 form. In the Challenger expedition it was obtained at depths ranging 



