129 Miocene Fossils, Olsson 



ed and provided with a fairly deep anal sinus; canal short, 

 straight . 



Length it, 15, breadth /, ^.5, body-whorl 5 .75 , 7.3, aper- 

 ture /, 4.. 5 mm. 



This species is related to D. pseiideburnea of the lower Mio- 

 cene of Maryland and New Jersey. D. pseudebumea has the rib- 

 lets continuous over the base and the anterior canal is some- 

 what longer. 



Duplin formation; Natural Well, N. C. 



Mitromorpha smithfieldensis, n. sp., Plate 2, Fig. 4 



Shell small, fusiform, with sharp spirals and few obtuse ribs 

 which are most prominent on the whorls of the spire; nucleus 

 blunt of about 2^ smooth whorls ; 3 post-nuclear whorls, each 

 somewhat overhanging the following; the 1st, sculptured with 

 4 spirals, heaviest below and with a small one bordering the 

 upper suture and separated from the 2nd by a wider interspace 

 than usual; on the succeeding whorls of the spire, a 5th spiral 

 may appear in the lower suture or just above; whorls angula- 

 ted by the 3th spiral; body-whorl with 14 spirals, the 1st 5 

 are heavy and sharp, the rest gradually become weaker anter- 

 iorly; body-whorl with 8 ribs, present only on the middle; in 

 addition a fine almost microscopic sculpture of incised transverse 

 lines is present, showing best between the spirals; canal short, 

 nearly straight; columella with about 2 obscure folds; outer 

 lip simple. 



Length 5.5, breadth 2 mm. 



A well-marked species occurring most abundantly on the 

 James river north of Smithfield, its type locality, but also known 

 elsewhere. 



Marginellatayiori, n. sp., Plate 2, Fig. 1 



Shell large, subcylindrical, narrow; apex covered entirely 

 by the last whorl but with no apical callus; aperture slightly 



