216 SYSTEMATIC PALEONTOLOGY 



Description. — " Test finely porous, formed of a nearly circular low 

 turbinoid spire, peripheral margin lobulated, obtusely rounded; chambers 

 numerous, ten to forty, somewhat inflated, about ten in the final convo- 

 lution, and separated by depressed nearly straight septal lines. Convolu- 

 tions about three, inferior surface thickened, and often beaded with ex- 

 ogenous granules at the umbilicus. Aperture a notched, subdivided 

 opening or a series of pores at the inner margin of the ultimate chamber. 



" Diameter 0.34—0.74 mm. 



The above species is a shallow water form and is rather common in the 

 Pleistocene formation at Cornfield Harbor." Bagg, 1898. 



Occurrence. — Talbot Formation. Wailes Bluff near Cornfield Har- 

 bor, St. Mary's County. 



Collections. — Maryland Geological Survey. 



Family NUMMULINIDAE. 



Genus POLYSTOMELLA D'Orbigny. 

 POLYSTOMELLA STRIATOPUNCTATA (Fichtel & Moll) . 



Plate LXVI, Figs. 14, 15. 



Nautilus striatopunctata Fichtel and Moll 1803, Test. Micr., p. 61, pi. iv, 



figs. a-c. 

 Polystomella striatopunctata Brady, 1884, Chal. Rept., vol. ix, p. 733, pi. cix, 



figs. 22, 23. 

 Polystomella striatopunctata Bagg, 1898, Bull. Amer. Paleont, vol. ii, No. 



10, p. 41, pi. ii, figs. 6a, 6b. 



Description. — " Test rounded, both sides equally compressed, peripheral 

 margin obliquely rounded, becoming somewhat lobulated near the ulti- 

 mate chamber ; segments triangular, ten in the last volution separated by 

 straight, slightly depressed septal lines which are in the shape of bridges 

 marking the retral process of the shell ; umbilicus very slightly depressed, 

 septal plane nearly round, aperature in the form of a series of pores or 

 openings along the inner margin of the ultimate segment." 



" Diameter 0.26^0.78 mm." Bagg, 1898. 



Occurrence. — Talbot Formation. Wailes Bluff near Cornfield Har- 

 bor, St. Mary's County. 



Collections. — Maryland Geological Survey. 



