36 Bulletin io 330 



septa; septal lines being more curved on the superior surface. 

 Aperture a small neatly shaped arch at the inferior margin of the 

 ultimate segment. 



Diameter, o. 6 mm. 



The above species shows great variation. Professor Brady con- 

 siders that the more convex varieties merge into Truncatulifia 

 refulgens, while flattened forms resemble Tmncatulina wuel- 

 lerstorji. The regularly built convex varieties constitute the 

 Tru7icatidina boueana d'Orbigny, while the less regular are 

 equivalent to Truncatiilma variabilis of the same author. The 

 latter species is well represented in the very irregular wide spread- 

 ings forms from Plum Point, Md. 



Horizon and locality. — Eocene; Woodstock, Va. : Miocene; 

 James River, Yorktown, and Norfolk, Va. ; Plum Point, and 

 Jones Wharf, Md. 



Truncatulina variabilis. 



Syn. Truncatulina variabilis d'Orbigny, Ann. Sci. Nat., vol. vii, p. 

 279, No. 8, 1826. 

 Truncatuli?ia variabilis Terquem, Mim. Soc. GeoL France, ser. 3, 

 voL II, Mem. iii, p. i, figs, 18—25, 1878. 



Test consisting of a depresssd, plano-convex, exceedingly 

 variable form, the segments of which are never uniform or reg- 

 ular in arrangement as in Truncatulina lobaluta but are more or 

 less evolute in shape and the amount of depression. The sur- 

 face of the shell is coarsely perforate. Aperture a wide gaping 

 arch extending along the inner margin of the final convolution. 



Diameter, 0.56 — i mm. 



Horizon and locality.— M-ioceno:; Plum Point, Jones Wharf, 

 Md. 



Geological distribtition. — Eocene to Recent. 



Genus PUL VINULINA Parker & Jones. 



Pulvinulina elegans. 



Syn. Rotalia elegans d'Orbigny, Ann. Sci. Nat. vol. vii, p. 276, No. 



54. 1826. 



Pulvinulina elegans Brady, 1884, Rept. Chal., p. 699, pi. cv,' 



figs. 4-6. 



Test large, orbicular, both sides convex, but more so upon the 



inferior side; surface rough, marked especially upon the inferior 



side by raised tubercles; peripheral margin sharp, slightly cari- 



nate. The chambers are arranged in three convolutions which 



