89 



ed ; base produced, attenuated ; labrum thickened on the submar- 

 gin within. 



Var. A. Not carinated. 



Syn. P. PBNITA, nqb, No. 8, first ed. p. 32. 



P. CANCELLATA, Lea, Con. p. 154 pi. 5, /. 160. 



P. ELBGANTI88IMA, ibid. pi. 5, /. 101. 



Locality. Clai borne, Alab. 



This shell agrees so well with the tricariitata, Lam. as figured 

 in Sowerby's Genera of Shells, that I here refer it to that species, 

 a fossil of the Calcaire grossier. That the variety is not distinct 

 I am assured by comparison of many specimens. 



EMARGINULA ARATA. Tab. 15, Jig. 8. 



Ovato-oblong, with angular ribs, largest anteriorly, alternated 

 in size and crossed by close set wrinkles ; apex central, acute, 

 much curved ; fissure wide but not very profound. 



Locality. Claiborne, ATab. 



This elegant species is extremely rare. No. 4, first ed, p. 44. 



FISSURELLA TENEBROSA. Tab. 15, fig. 9. 



Oval, elevated, slightly compressed above ; with numerous deli- 

 cate costiB alternated in' size, dnd crossed by very fine striae, 

 'giving the ribs a granulat'ed appearance ; fissure narrow, inclined ; 

 inferior margin with crenulations disposed in pairs. 



Syn. F. CLAIBORNENSIS, Lea. Con. p. 94, pi. 3, /. 74. 



Locality. Claiborne, Alab. . 



Rare and seldom perfect. No. 3, first ed. p. 33. 



DENTALIUM THALLOIDES. Tab. 15, fig. 10. 



Elongated, slightly curved, with prominent longitudinal costic, 

 alternated in size, or of three different sizes. 



Syn. D. ALTKRNATUM, Lea. Con. p. 34, pL 1, fig. 2. 

 Locality. Claiborne, Alab. 



,j~" -9 . 



[95] 



