141 Miocene Fossils, Olsson 21 



closely appressed, the coiling being along the upper carina. In 

 C. shacklefordensis, the coiling is along the lower carina, thereby 

 producing a deep, excavated suture. 

 Mioceiie ; Shackleford, Va. 



Teinostoma miocenica, n. sp., Plate 3, Fig,s 14, 15 



Shell small, solid, porcellanous ; whorls 3%', increasing ra- 

 pidly in size, through their close coiling ; suture appressed, of- 

 ten indistinct ; nucleus of about 2 smooth whorls separated by 

 a fairly deep suture ; post-nuclear whorls with fine but even spi- 

 rals which are strongest on the area bordering the suture and on 

 the base ; umbilical area covered with a thin callus, over which 

 the spirals pass, and by a heavy thickening of the columellar 

 wall ; mouth nearly round, oblique, with a thin, outer lip. 



Greater diameter 2.25 , lesser dia??ieter r.5, height 1 .5 mm. 



This species may be known by its covered umbilicus, 

 close coiling and spirally sculptured surface. T. opsitelotusDaM, 

 is similiarin its method of coiling but is only obsoletely striated 

 and with an open umbilicus. 



Duplin formation; Natural Well, N. C. 



Teinostoma ibompsoni, n. sp., Plate 3, Fig's 3, 4 



Shell very small, depressed, porcellanous, polished ; whorls 

 about 3, the earlier, covered to a variable extent by the closely 

 appressed suture of the body-whorl ; upper surface smooth, 

 with indistinct growth lines ; the periphery when viewed from 

 above, shows fairly even radial groovings ; base flattened ; um- 

 bilicus covered ; the basal surface strongly sculptured by ra- 

 dial grooves and growth lines ; mouth oblique, subovate. 



Greater diameter 1 .5 ', lesser diameter 1 .00 , height .75 mm. 



This species is related to T. nanuni Lea, a common and 

 widespread Miocene shell. It differs from that species in its 

 smaller size, more depressed shape, strongly sculptured base and 



