335 Tertiary Foraminifera 41 



Test strongly depressed, convolute, peripheral edge round; 

 chambers numerous, ten to twelve in the last volution, slightly 

 curved septa; septal lines distinct and but faintly depressed, be- 

 coming more nearly straight as they approach the ultimate 

 chamber. Umbilical area granulated, nearly flush with the gen- 

 eral surface of the shell. Shell-wall thin and hyaline. Aperture 

 a narrow elongated slit. 



Diameter, 0.26 to 0.34 mm. 



Professor Brady considers this shallow water form as a starved 

 variety of its allies the home of which is in water of less than 

 fifty fathoms, and whose distribution is almost universal. 



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

 Yorktown, Va. 



Geological distributio7z.— Eocene to Recent. 



Nonionina scapha. 



Syn. Najitilus scapha Fichtel &M0II, 1803, Test. Micr., p. 105, pi. xix, 

 figs, d— f. 

 Nonionina scapha Brady, Chal. Rept., vol. ix, p. 730, pi. cix, 

 figs. 14, 15, and 16 ?, 1884. 



Test free, hyaline, finely perforate, elongate, rather strongly 

 compressed, peripheral margin broadly rounded, chambers num- 

 erous, narrow and long, rapidly increasing in size toward the 

 ultimate chamber and separated by nearly straight septal lines 

 which are only slightly depressed. The ultimate chamber is the 

 largest and longest, extending fully two-thirds the length of the 

 shell. The septal plane is broadly oval or somewhat cordate; 

 convolutions about three; twelve to fourteen chambers in the last 

 volution, aperture a small concentric shaped median slit at the 

 inner margin of the final segment. 



Length, 0.39 — o. 65 mm. 



Breadth, 0.3 — 0.47 mm. 



This a common form in the Miocene. 



Horizon and locality. — Miocene; James river, Yorktown, Va. 

 Plum Point, Md. 



Geological distribution. — Miocene to Recent. 

 Polystomella striatopunctata. 



Syn. Nautilus striatopunctata 'Pich.t&l 8i. Moll, 1803, Test. Micr., p. 61, 

 pi. iv, figs. a~c. 

 Polystomella striatopunctata Brady, Chal. Rept., vol. ix, p. 733, pi. 

 CIX, figs. 22, 23. 



