53 Oi^son, Neocene Fossils 15 



impressed and flattened ; beaks more inclined anteriorly and 

 with the furrow extending further underneath the beak on the an- 

 teriorand posterior submargins ; umbo narrower with more pointed 

 beaks. The anterior dorsal submargin of .5. curtidens appears from 

 the fragmentary type to have been more depressed. 



Dulpin formation ; Peedee river f , S. C. 



Ensis schmidti, n. sp., Plate 3, Fig's 1-3 



Shell large, thin, elongated but fairly wide, gaping at both 

 ends ; dorsal margin straight, but with the beaks curved upward ; 

 basal margin of shell evenly rounded ; posterior extremity round- 

 ed or truncated ; anterior extremity obliquely truncated with a 

 low furrow extending from the beak, parallel to side ; surface 

 smooth, polished, growth lines most strongly developed on the 

 posterior portion of the shell ; there is a faint indication of two 

 or three rays extending from the beak to the posterior portion of 

 the basal margin ; left valve with three teeth, right valve with 

 two teeth ; anterior muscle scar very elongated. 



Length (type} 94., height 28, thickness 12 mm. 

 This species is very different from any of the other Miocene 

 Enses. From these it is distinguished by its relative shortness, 

 height, and large size. At the type locality the species occurs in 

 a yellow sand and is not uncommon. 



Yorktown formation ; Jack's Bluff on the N an semond river, 

 Va. Also at Suffolk, Va., at the Standard Oil tanks. 



Semele nelliana, n. sp., Plate 3, Fig's 5,6 



Shell large, thin, inequilateral, moderately inflated ; the an- 

 terior end longer than the posterior ; beak small and pointed, 

 slightly rounded or obscurely truncated ; basal margin obliquely 

 rounded ; posterior dorsal slope slightly impressed ; lunule of left 

 valve very small ; sculpture of two kinds, a radial and a concen- 

 tric ; radial sculpture very distinct, of threadlets, rather low, wide 

 (on the middle of the shell disk of an average width of .75 mm), 



