124 PROCEEDINGS OF THE NATIONAL MUSEUM vol.77 



basal portion of the test, sometimes covering a large portion of the 

 surface. As a rule the variety and the typical form do not occur 

 together, although both occur at Jackson, Miss., and at a station 1 

 mile east of Beck, Covington County, Ala. 



Maximum length 1.20 mm. ; breadth 0.50 mm. ; thickness 0.13 mm. 



Distribution. — The localities of the variety in our collection are all 

 from the upper Eocene. Jackson formation, Mississippi, roadside on 

 hill above pumping station, Jackson; BluflP on Garlands Creek, about 

 5 miles northeast of Shubuta, Clarke County; large ravine about 1 

 mile south of Yazoo City, Yazoo County. Alabama, east bank 

 of Sepulga River, about 4 miles northeast of Brooklyn, Conecuh 

 County; road from Perdue Hill to Claiborne, Monroe County; bank 

 of small stream entering Conecuh River, northeast Yi sec. 6, T. 3 N., 

 R. 15 E., 1 mile east of Beck, Covington County. Georgia, Rich Hill, 

 Crawford County, 6 miles southeast of Roberta. Florida, road near 

 Blue Springs, Jackson County. South Carolina, Barnwell sand, 

 Barnwell County. 



A few specimens evidently of this variety are from the Gosport sand 

 of the Claiborne, near Claiborne, Ala. 



SIGMOMORPHINA CHAPMA>n[ (Heron-Allen and Earland) 



Plate 32, figures 4, 5 



Polymorphina chapmani Heron-Allen and Earland, Journ. Roy. Micr. 

 Soc, 1924, p. 163, pi. 10, figs. 60-63. 



"Test compressed, sharp at the marginal edges; thickest at a point 

 between the edge and the median line, which is somewhat depressed; 

 consisting of 4 to 6 pairs of chambers, rapidly increasing in size, 

 arranged alternately on each side of the median line. The whole 

 shell has a spiral twist to the extent of about a quarter of a convolu- 

 tion on this median axis. Sutures flush and obscure but thick. 

 Aperture typical but inconspicuous. Not infrequent and one of the 

 most striking forms in the deposits. Its structure is very obscure, but 

 it appears to represent a thin and sharply carinate and twisted form 

 of P. humboldti Bornemann. Length 0.80-1.50 mm." 



Distribution. — Janjukian, "Filter quarry," Batesford, Victoria, 

 Australia. 



Sigmomorphina chapmani is one of the best defined species among 

 the genus. We have examined material from Filter quarry, but no 

 specimen of this species was found; therefore Heron- Allen and 

 Earland's description is cited above, and their figures are copied here. 



SIGMOMORPHINA NUTTALLI Cushman and O/^wa. new species 



Plate 32, figures 6 a, b 



Test compressed, more or less inflated in the median, longitudinal 

 area, rounded at the base, periphery somewhat acutely edged; 



