ART. 6 FORAMINIFERA : POLYMORPHINIDAE — CUSHMAN AND OZAWA 123 



The present species is described by Reuss as a variety of Polymor- 

 phina regularis and the varietal name ^'nysti" is only used in the ex- 

 planation of the figure. It is related to the German Oligocene species 

 S. regularis in some features, but the present species has shorter and 

 noninflated chambers and the test is narrower with straight sides. 



Distribution. — Reuss recorded this species from the Crag of Ant- 

 werp. We have found it in the Miocene, Burdigalien inferieur, Le 

 Coquillat, Leognan, France, a specimen from this locality being 

 figured here. 



SIGMOMORPHINA JACKSONENSIS (Cushman) 



Plate 32, figures 2 a, h 



Polymorphina jacksonensis Cxjshman, Contr. Cushman Lab. Foram. Res., 



vol. 2, 1926, p. 35, pi. 5, figs. 5 a, b. 

 Polymorphina compressa Nuttall, Quart. Journ. Geol. Soc, vol. 84, 1928, 



p. 93, pi. 6, figs. 18, 19. 



Test broad and compressed, periphery broadly rounded, apertural 

 end narrowed to a slightly produced aperture; chambers elongate, 

 slightly inflated, embracing, arranged in a contraclockwise, sigmoid 

 series, each succeeding chamber removed farther from the base; 

 sutures very slightly depressed, distinct, almost straight; wall thick, 

 smooth; aperture radiate. 



Maximum length 1.10 mm. ; breadth 0.65 mm. ; thickness 0.25 mm. 



Sigmomorphina jacksonensis more or less resembles S. regularis in 

 some features, but the latter has more inflated chambers arranged in 

 a clockwise, sigmoid series. 



Distribution. — The type locality for this species is near Blue Springs, 

 Jackson County, Fla. The other localities of our specimens are as 

 follows: Upper Eocene, Jackson, Miss. Jackson, west bank of 

 Chickasawhay River, IK miles south of Shubuta, Wayne Countj^, Ala. ; 

 on small stream entering Conecuh River, NE. % sec. 6, T. 3 N., R. 15 

 E., 1 mile east of Beck, Covington County; about 3K miles southeast 

 of Culiomburg, road from Bladen Springs to MOlry. Cocoa sand, 

 Cocoa post oflSce. Ocala limestone, branch at road in sec. 7, T. 6 N., 

 R. 6 E., m miles southwest of Perdue Hill, Monroe County, Ala. 

 Barnwell sand, Barnwell County, S. C. Claiborne, Lisbon formation, 

 1 mile north of Watubbee Station, Clarke County, Miss. It occurs at 

 numerous other Claiborne localities not listed here. Trinidad, Mount 

 Moriah beds, Vistabeila quarry. 



SIGMOMORPHINA JACKSONENSIS (Cushman) var. COSTIFERA (Cushman) 



Plate 32, figurse 3 a, b 



Polymorphina jacksonensis Cushman var. costifera Cushman, Contr. Cush- 

 man Lab. Foram. Res., vol. 2, 1926, p. 35. 



Variety differing from the typical in the ornamentation of the test, 

 which in the varietv has several rounded longitudinal costae on the 



