333 Tertiary Foraminifera 29 



and somewhat convex, separated by fairly deep sutures; aper- 

 ture mammillate. 



d'Orbigny considers that Guttulina nitida is closely related 

 to this species but states that it differs from it in the more 

 elevated chambers. Our specimens are slightly more acute post- 

 eriorly than d'Orbigny's figure. 



Horizon and locality. — Eocene; Woodstock, Va. 



Geological distribution. — Tertiary. 



Polymorphina communis. 



Syn. Guttulina communis d'Orbigny, Ann. Sci. Nat., vol. vii, p. 266, No. 

 15, pi. xii, figs. 1-4; Modele, No. 62, 1826. 

 Polymorphina communis Bagg, Bull. U. S. Geol. Surv., No. 141, p. 

 92, 1896. 

 Test irregular ovoidal, or egg-shaped, consisting of four or 

 five distincft segments; anterior extremely acute, posterior ob- 

 tuse; chambers inflated, elliptical, embracing; surface smooth with 

 distindl septal depressions; aperture mammillate; diam. 0.35 mm. 

 This species occurs quite abundantly in the New Jersey Cre- 

 taceous but the forms are much larger than in the Eocene 

 of Maryland. 



Horizon and locality. — Eocene; Woodstock, Va. ; Pamunkey riv- 

 er, Va. 



Geological distribution. — Eias to Recent. 

 Polymorphina compianata. 

 Syn. Polymorphina coi7iplanata d'Orbigny, Foram. Foss. Vien., p. 234, 

 pi. xiii, figs. 25-30, 1846. 



Test complanate, elongate, resembling Frondicularia in out- 

 line, chambers numerous, arranged biserially; anterior end acute, 

 posterior obtusely rounded, lateral margins rounded, nearly paral- 

 lel; septal lines depressed, slightly oblique and alternating; cham- 

 bers somewhat lobed at the margin and elevated but not strong- 

 ly so; surface smooth; aperture mammillate; length 1.73 mm., 

 breadth 0.50 mm. 



Horizon and locality. — Eocene; Pamunkey river, Va. 

 Geological distributio?i. — Cretaceous and Tertiary. 

 Polymorphina compressa. 

 Syn. Polymorphina compressa d'Orbigny, Foram. Foss. Vien., p. 233, pi. 

 xii, figs. 32-34, 1846. 

 Polymorphina compressa'Bra.diy, Parker and Jones, Trans. Linn. Soc, 



