4l5 TRANSACTIONS OF THE WAGNER FREE 



keel ; base rounded, flattish, falling evenly into the simple subcylindrical 

 umbilicus, which has no rib or keel and is surrounded by a smooth, not 

 elevated, callous area ; aperture rounded except at the upper commissure ; 

 body with a thin callus, pillar thick, concavely arched. Alt. i.o ; max. diam. 

 2.6 ; min. diam. 2.0 mm. 



This species seems to be more nearly the size of T. quadra ngtdare, but 

 differs in the basal characters. There is no rib or angle on the pillar, and the 

 umbilicus is rather large for the size of the shell. More specimens might 

 show at perfect maturity additional characters, but the species may easily be 

 recognized by the simple rounded peripheral keel. 



Teinostoma vortex n. s. 



Newer Miocene of the Cape Fear River, North Carolina. 



Shell very small, disk-like, of three and a half whorls; surface polished, 

 sculptured only with numerous impressed incremental lines ; first whorl rather 

 prominent, subsequent whorls somewhat excavated in front of the inconspicu- 

 ous appressed suture ; last whorl slightly descending and somewhat expanded 

 near the aperture; periphery evenly rounded, whorls full; aperture trans- 

 versely ovate, oblique, thin-edged, a thin wash of callus on the body ; pillar 

 thin, not differentiated from the rest of the margin, externally with a broad, 

 thin lamina, which is closely applied to the preceding whorl, but forms an 

 ovate funicular umbilical area, more opaque than the rest of the shell, and 

 having a minute central chink leading into the covered umbilicus. Max. 

 diam. 1.7; min. diam. 1.2; alt. 0.6 mm. 



A single specimen of this well-marked little shell was obtained from the 

 marls, but was unfortunately smashed by the draughtsman before a figure was 

 completed. 



Teinostoma coUinus n. s. 



Plate 23, figure 14. 



Newer Miocene of the Cape Fear River, North Carolina. 



Shell resembling the preceding, but much more elevated and turbinate, 

 the depression in front of the suture feeble, the incremental lines not impressed 

 the umbilical lamina lower down on the pillar, so that it does not reach the 

 preceding whorl, and the excavation above it is plainly visible, while the 

 callous umbilical area formed by the lamina has a more irregular, obliquely 

 wrinkled surface and rises above the whorl at its margin. The shell has four 

 whorls, a polished surface and a circular aperture; the pillar-lip, apart from 

 the lamina, is thin. Alt. of shell 1.3; max. diam. 2.0; min. diam. 1.5 mm. 



A single specimen with the aperture imperfect but clearly different from 

 any of the others was obtained. The general profile of the spire is domelike, 

 the sutures being inconspicuous, and the whole shell is rather thinner than in 

 most of the other species. 



