363 IviGNiTic Stage 71 



Conrad's original description. — " Shell suborbicular, equilat- 

 eral, obscurely cancellated, with three or four profound concen- 

 tric sulci ; and an indented fold on both sides, terminating in an 

 emargination of the ends ; beaks prominent, lunule profoundly 

 impressed, cordate ; cardinal and lateral teeth very distincft ; mar- 

 gin crenulated." From Claiborne, Ala. 



The specimens in question (Lignitic) are much smaller than 

 their Claiborne representatives and do not closely resemble the 

 adults at the latter locality. Yet the young are the same from 

 both horizons, and there is little doubt but that they are one and 

 the same species. 



Localities (Lignitic). — Alabama: Woods Bluff; Ozark; 4 miles 

 above Hamilton Bluff. 



7>/^.— Nat. Acad. Sci., Phila. 



Specimens figjired. — Woods Bluff; Paleont. Museum, Cornell 

 University. 



Lucina symmetrica? PI. 14, fig. 4. 



Syn. L.rotunda Aid., Bull, i, Geol. Surv. Ala., p. 50, 1886. 



This Lucina from Hatchetigbee, is somewhat closely related to 

 symmetrica Con., rotunda I^ea, but should presumably be describ- 

 ed as new. We await more material from this and other upper 

 Lignitic and lower Claiborne horizons. 



Lucina ulrichi, PI. 14, figs. 5, a. 6. 



Syn. L. ulrichi Clark, Johns Hop. Univ. Circ, vol. xv, p. 5. 



L. ulrichi Clark, Bull. U. S. Geol. Stuv., No. 141, p. 79, pi. 21, 

 figs. I, a-d. 



Clark's original description. — "Shell small, orbicular; surface 

 with numerous, uniform, elevated, concentric ridges ; anterior 

 and posterior sides rounded ; interior with radiating striae ; mar- 

 gin simple. Dimensions: Length, 5 mm.; height, 4 mm. 



' ^Locality. — Virginia: Woodstock. 



The specimens we refer to this species are closely allied to L. 

 viodesta Con., from Claiborne. But in specimens from that local- 

 ity the superior portion of the posterior margin extends beyond 

 the inferior, while in this the reverse is true. Again, in the Clai- 

 borne specimens the anterior cardinal tooth in the left valve, is 

 frequently well defined and vertical or sloping anteriorly down- 



