145 I\1ioce,ne Fossils, Olsson 25 



al depressions parallel to the growth lines ; base with a wide, 

 funnel-shaped umbilicus, bordered by two, fairty strong, raised 

 spirals, with fainter spirals nearer the peripher}^ ; aperture near- 

 ly quadrangular, markedly expanded and flattened below, above 

 angulated near the parietal wall. 



Greatest diameter 1 .5 , height .7 mm. 



The species here described, agrees in its fundamental char- 

 acters with C. humilis Bush, a recent Hatteras shell, and type 

 of the genus Cyclostremella Bush. The most obvious differ- 

 ences to be noted in the Miocene shell are its smooth, upper 

 surface and more strongly striated base. 



Duplin formation ; Natural Well, N. C. 



PsamiTsobia gubersiatoria Glenn, var. daili, n. var., Plate 2, Fig. 2 



In the Miocene at Chocowinity, N., C. a form of Psammo- 

 bia occurs quite plentifully but rarely in perfect condition. 

 These shells are close to the Maryland Psammobia described 

 by Glenn as gubernatoria. They differ in a few characters, which 

 on future reseach may prove constant enough for their specific 

 separation. I have a fragment of a large Psammobia from 

 Kingsmill Va, evidently the same as the North Carolina shell, 

 thus indicating a fairly extensive range during Yorktown times. 



The North Carolina shell is larger and porportionally long- 

 er, and with the beaks more centrally located ; the surface is 

 smooth, with incremental growth lines which are deeper and ir- 

 regular on the posterior slope ; a small callus is frequently dev- 

 eloped just in back of the beaks. 

 Length 62, height 32 mm. 



Aligena pustulosa Dall, var. choptankensis, n. var., Plate 3, Fig. 1 



Aligeua puslulosa Glenn, Maryland Geol. Surv., p. 334 (not description, 

 nor figure) ; not of Dall, 1898. 



Shell in shape like A . pustulosa Dall, but somewhat wider 



and of a general larger size ; surface posterior to the carina with 



