CRETACEOUS FORAMINIFERA. 33 
Pleurostomella, Bolivina.] 
ventricose and prominent ; the anterior one usually more oblong than the rest, from 
its anterior part not being embraced, as all the preceding ones, by the next segment. 
Septal plane convex; semilunar. Septal orifice single, placed near the umbilical 
border of the septal plane, and usually characterized by a curious obliquity at its 
inner part, owing to the two lips of the orifice not meeting at their umbilical 
extremites, but passing one behind the other. Texture hyaline; transparent ; when 
examined after being mounted in Canada balsam, through a high power, it is seen to 
be perforated by innumerable minute foramina. Wuiii1Amson, (Recent Foraminifera 
Gt. Brit., p. 62.) 
Locality. Meeker county, Minnesota; Saline county, Nebraska; South Chicago, Illinois. Of the 
material examined containing this species, in that from Minnesota it was quite rare; from Nebraska very 
common, and in that from Illinois, rare. It has also been found in the Post-tertiary of Canada. 
PLEUROSTOMELLA, Reuss. 
PLEUROSTOMELLA SUBNODOSA Feuss. 
PLATE O, FIG. 25. 
Nodosaria nodosa (pars.) REuss, 1845. Verstein. Bohm. Kreid., pt. 1, p. 28, pl. xiii, fig. 22 (fide Reuss). 
Dentalina subnodosa (pars.), Id. 1850. Haidinger’s Naturw. Abhandl., vol. iv, p. 24. plate i, fig. 9 (fide 
Reuss). 
Pleurostomella subnodosa, Id. 1860. Sitzungsb. d. k. Ak. Wiss. Wien, vol. xl, p. 204, pl. viii, fig. 2, a, b. 
Pleurostomella subnodosa MARSSON, 1878. Mittheil. Naturw. Vereine Neu-Vorpom. u. Rigen, Jahrg. 
X, p. 133. 
Pleurostomella subnodosa BRADY, 1884. Report on Foram. H. M.S. Challenger, Zool., vol. ix, p. 412, 
figs. 12, 13. 
“D. subnodosa (T.1. f. 9), elongata, subrecta; loculis fere regulariter incres- 
centibus, parum convexis, ultimo maximo, convexo, breviter acuto ; primo minimo 
obtusum-sculo; apertura nuda. Long.—1.15 mm.” Reuss. (Haidinger’s Naturw. 
Abhandl., vol. iv, p, 24, pl. 1, fig. 9.) 
Test elongated, nearly straight ; chambers quite regularly increasing, slightly 
convex, the last one the largest, convex, shortly acute ; the first chamber smallest, 
rather obtuse ; aperture naked. 
Locality. Saline county, Nebraska ; South Chicago, Illinois. 
BOLIVINA, d’Orbigny. 
Bouivina DILATATA Leuss, 
PLATE ©, FIG. 26. 
Bolivina dilatata Reuss, 1849. Denkschr. d. k. Akad. Wiss. Wien, vol. i, p. 381, pl. xlviii, fig. 15. 
Bolivina dilatata TERRIGT, 1880. Atti del? Accad. Pont., ann. xxxili, p. 197, pl. ii, fig. 42. 
Bolivina dilatata BRADY, 1884. Report on Foram. H. M.S. Challenger, Zool., vol. ix, p. 418, pl. lii, 
figs. 20, 21. 
Bolivina dilatata. “Testa cuneata, superne dilatata, infra acuta, compressa, punc- 
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