325 Tertiary Foraminifera. 31 



al constridlions. Septa are visible as delicate, oblique lines; 

 transverse sedlion nearly circular; aperture mammillate; length 

 0.35 mm., breadth 0.30 mm. 



Specimens of the above species from the Eocene of Maryland 

 are very similar to those from the Navesink formation (lower 

 marl bed) of New Jersey, but the Eocene forms are much small- 

 er. It is not a common species in the Eocene. 



Horizon and localitv. — -Eocene; Woodstock, Va. 



Geological distributio7i. — Jurassic to Recent. 



Polymorphina lactea. 



Syn. Serpula lactea Walker and Jacob, (fide Kanniacher's Ed.), Adams 

 Essa3^s Microsc. p. 634, pi. xiv, fig. 4, 1798. 

 Polymorphina lactea Brady, Parker and Jones, Trans. Linn. Soc. 

 London, vol. xxvii, p. 213, pi. xxxix, fig. i, a-c, 1870. 



Test ovate or subpyriform, only slightly compressed, consist- 

 ing of three or four chambers with flush sutures and scarce- 

 ly distinct septal lines; aperture terminal, radiate; diam. 0.39 

 mm. 



Horizon and locality . — Miocene, Plum Point, Md. 



Geological distribution. — Jurassic to Recent. Not common. 



Polymorphina praelonga. 



Syn. Polymorphina prcelonga Terquem, Mem. Soc. geol. France, ser. 3, 

 vol. i, p. 39, pis. iii, viii, figs. 20, 21; 1878. 

 Polymo7'phina prcelonga Bagg, Johns Hopkins Univ. Circulars, vol. 

 XV, p. 5, 1895. 

 Test elongate-oval, attenuated anteriorly; smooth and glisten- 

 ing, nearly circular in transverse se(?tion; three or four slight- 

 1}^ raised, elongate chambers, marked b}' somewhat depressed 

 septa; length 0.79 mm. 



This species with its many varieties is beautifully illustrated 

 in Terquem 's monograph on the Eocene Foraminifera of Par- 

 is. According to that author this species is more abundant 

 in the Eocene, being quite rare in deposits of Pliocene age. 

 Horizon and locality . — Eocene; Woodstock, Va. 

 Geological distribution. — Eocene to Pliocene. 



Genus UIVGERINA d'Orbigny. 



Uvigerina canariensis. 



Syn. Pvigerina canariensis d'Orbigny, Foram. Canaries, p. 138, pi. i. 



