TJie Tertiary Fauna of Neivtojt and IVautubbee, Miss. 43 



constitute the nucleus, which is situated near the margin. Its 

 plane does not coincide with the general plane of the shell. 

 Umbilicus hidden by callus. 



Newton. 



There is only one flattened species of Sigaretus known from 

 the Southern Tertiary, .S/X"". arctaiiis Conr. Its nucleus, however, 

 is not marginal and lies in the plane of the shell, 



Ccrithiflpsis giiadrisfriaris, n. sp. 



Plate II. Figure 5. 



Subulate. Whorls flat, covered by four smooth, elevated 



spiral lines, with nearly e([ual distances. The two in the middle 



are smaller than those near the sutures. Suture defined by a very 



small, elevated revolving line. 



Newton, Miss., Clail)orne, Ala. 

 The type is from Newton. 



Cassida/-/a plaiwtccta, n. sp. 

 Plate II. Figure 14. 

 Spire very much flattened. Three and a half embryonic 

 whorls form a sul)globular nucleus. Adult whorls four. Body 

 whorl with two carinas, the upper one carrying subspines. Sur- 

 face covered with rather distant, elevated, revolving lines. Inner 

 lip spread over the body whorl. Columella irregularly tubercu- 

 lated. 



Newton. 



The figure on the plate, though still representing a fragment, 

 is restored from two specimens. The form is characterized by its 

 flat spire. 



ColiivibcUa niississippicusis, n. sp. 



Plate II. Figure 17. • 

 Spire elevated. Whorls nine, slightly convex ; the last four 

 with an impressed line along the suture. Base of body whorl 

 spirally striated. Columella excavated, anteriorly with three tu- 

 bercles. Outer lip thickened, crenulated within by about seven 

 striae, of which one in the middle is the largest. 

 Newton. 



Fusil s Ncivtojicnsis^ n. sp. 

 Plate II. Figure 11. '' 

 Short fusiform. Aperture and canal more than half the 

 length of the shell. Wjiorls regularly rounded. More than three 



