1 8 BUIXETIN 27 138 



al Museum. 



Duplin formation; Natural Well, N. C. (type locality) 

 Yorktown formation; fames river, above Smithfield, Va. 



Triphoris duptiniarca, n. sp., Plate 3, Fig. 8 



Shell sinistral, elongate-conic, with nearly straight sides ; 

 nuclear whorls 1 +, the last turn with transverse ribbing and 

 2 peripheral carinae ; post-nuclear whorls 1 1 , suture indistinct ; 

 the 1st 5 whorls, with 2 subequal spirals, on the 6th whorl, an 

 intermediate spiral makes its appearance and increases gradual- 

 ly in strength ; on the body-whorl, the uppermost spiral is the 

 strongest ; spirals tuberculated by 2 2 riblets which moreover ex- 

 tend somewhat diminished across the interspiral spaces ; base 

 sloping, with 3 smooth spirals ; columella smooth; anterior ca- 

 nal moderately long, closed or nearly so and bent both to the 

 right and backwards ; mouth small, rounded ; outer lip oblique, 

 with a deep anal notch bodering the suture. 

 Length 5.75, breadth 1.75 mm. 



This species belongs to the group of Triphoris, such as T. 

 melanura, which have only 2 spirals on the earlier post-nuclear 

 whorls, later 3, with the last spiral coming in between the other 

 2. The open, anal sinus and bent, tubular anterior canal are the 

 main diagnostic characters of this species. 



Duplin formation ; Natural Well, N. C. 



Yorktowyi formation ; fames river, north of Smithfield, Va. 



Circulus schmidti, n. sp., Plate 3, Fig. 16 



Shell small, depressed, with the whorls flattened above and 

 below, and with 2 carinae bordering the upper and lower surfaces 

 of the shell ; whorls about 4, the 1st 2^ turns are smooth and 

 forms a small pointed spire distinctly elevated above the later 

 flattened whorls ; the remaining whorls with raised spirals which 

 commence coarse and alternating but soon become fine and re- 

 gular ; base with a deep, wide umbilicus, showing the whorls 



