74 Bulletin 31 74 



bonal region seems heavy, deep, inturning, when compared with 

 the same parts of individuals from the St. Maurice Stage (var. 

 mawicensis, n. var., figs. 4-6). Compare pi. 26, figs. 2 and 3 

 with fig. 4. Also note that the width of fig. 8 is to its height as 

 I : 2.3. The typical older, or mauricensis variety as here figured 

 is found at the base of the bluff just above the Upper I^anding at 

 Claiborne and at lyisbon, in Alabama and westward into Texas. 

 Likewise in the Orangeburg District of South Carolina, though 

 there, as usual, a tendency is shown to assume something of a 

 true Claiborne aspect. 



7)//^.— Phila. Acad. Nat. Sci. 



Horizon. — Claiborne and St. Maurice Eocene stages. 



specimens figured. — Paleont. Mus., Cornell Univ. 



Localities. — Texas (where according to my MS report to the 

 Texas Survey, 1893, "The specimens have slightly less conspic- 

 uous beaks, the center of the lunule is slightly more elevated and 

 the lunule is shorter than in the specimens from Claiborne' ' ) : 

 Devil's Eye, Col. Riv. ; Col. Riv. just below the mouth of Alum 

 Cr. ; Smithville ; Little Brazos River, Mosley's Ferry road ; Bra- 

 zos River 500 yards below the mouth of Little Brazos River ; 

 Cedar Creek, S. E. Cor. Wheelock League ; Elm Creek, Lee Co. ; 

 Campbell's Creek, Robertson Co. ; Sabine River. Louisiana : 

 Sabine River ; Hammett's Branch ; Monroe well ; Columbus, 

 Noble's Landing, Ouachita River. Alabama : CofFeeville ; Lis- 

 bon ; base of Claiborne Bluff ; Claiborne sands. South Carolina : 

 3 and 6 miles W. N. W. of Orangeburg ; 5 miles N. of Orange- 

 burg. North Carolina : 17 miles above Newbern on the Neuse 

 River. 



Nucula ripse, n. sp., PI. 26. Figs. 9-10. 



Specific characte7^i2ation. — Form and size as indicated by the 

 figures and explanations ; surface covered with fine, somewhat 

 irregular lines or small folds of growth ; lunular and escutcheon 

 areas broad, with margins of the valves raised or pouting ; no 

 sharply defined radiating lines on these areas separating them 

 from the general surface of the valves, the definition being 

 brought about by fairly well defined obtuse, radiating ridges ; 



