125 Miocene Fossils, Olsson 



Mangilia smithfieldensis, n. sp., Plate 2, Fig. 12 



Shell moderately large and fairly broad; whorls of the spire 

 angulated; nucleus of about 3 unkeeled whorls, the 1st smooth, 

 the 2nd with curved riblets, the 3d in addition with 8 spirals in 

 the interspaces between the riblets; post -nuclear whorls 4, angu- 

 lated; suture not impressed; riblets 11 or 12, extending from sut- 

 ure to suture, obsolete on the base and on the canal; spiral sculp- 

 ture of fairly even, wavy, unfrosted spirals; canal straight; a- 

 nal sinus not evident on any of the specimens examined; mouth 

 broad and fairly long, with a thin outer lip. 



Length 8.5, breadth j .5 , aperture 4, body-whorl 5.5mm. 



This species may be known by its unkeeled nucleus, even 

 unfrosted spirals and by the number of its ribs. 



Yorktown formation; James river, north of Smithfteld Va. 



Drillia gastrophiia, n. sp., Plate 1, Fig. 12 



Shell heavy, of fair size with ribs and spirals, but without 

 a pronounced contracted subsutural band; protoconch blunt of 

 nearly 1^ whorls, the first ^ turn smooth, followed by a turn 

 with 3 strong spirals, of which the lowermost appears first; the 

 change from the nuclear to the post -nuclear stage is abrupt; the 

 post-nuclear whorls are about 7, the first with 11 small ribs; the 

 first and the succeeding whorls of the spire have their ribs cut 

 by 2 spiral bands; the last whorl carries 6 spirals which are even 

 above but flatten out and merge with additional spirals below; 

 the suture is bordered by a heavy raised spiral, completely fil- 

 ling the subsutural zone at first, but latter only partially; body 

 whorl with about 13 ribs; anal sinus shallow. 



Length 11, breadth 4., body-whorl 6 , aperhire ^mm. 



The species may be known by its straight sided whorls, its 

 small contracted sutural zone with the strong spiral bordering 

 the suture and by the characteristic sculpturing of its post-nu- 

 clear whorls. 



Dttplin formation ; Natural Well, N. C. 



