Sg LiGNiTic Stage 89 



Tex.: Sabinetown. 



Specimen figtired. — From Bell's landing; Paleont. Mus., Cor- 

 nell Univ. 



Natica magno-umbilicata, PI. ir, fig. 23. 



Syn. A'^. juagno-umbilicata Lea, Cont. to Geol., 1833. p. 109, pi. 4, fig. 



94- 

 N. magno-ninbilicata Aid., Geol. Surv. Ala., Bull, i, 18S6, p. 51. 

 A^. magno-umbilicata Dall, Trans. Wag., etc., vol, 3, p. 366. 



Lea's original description. — "Shell subglobose, smooth; sub- 

 stance of the shell thin; spire depressed, rounded; suture small; 

 columella v^ery slightl3^ thickened, the callus being small and re- 

 fle<5led above the middle of the umbilicus; umbilicus ver}'' wide, 

 grooved; whorls three, inflated, with longitudinal folds on the 

 superior part; mouth semi-lunate, nearly three-fourths the length 

 of the shell." Claiborne, Ala. 



The Lignitic form differs very materialh' from the typical Clai- 

 bornian. It is larger, thicker, with a higher spire, with only traces 

 of plications below the sutures, and no columellar callosity. It 

 will doubtless some day be referred to a distin(5l species. 



Lignitic localities. — Ala.: Woods bluff. Aldrich finds it also 

 at Chodlaw corner and Butler. 



Type. — Academy of Natural Sciences, Philadelphia. 



Specimen figured. — Paleontological Museum, Cornell Univer- 

 sity. 



Natica (Neverita) onusta, Pi. n, fig's. 24-26. 



Syn. A^. (Polinices) onusta Whitf., Am. Jr. Conch., vol. i, p. 264, 1865. 

 A', onusta Aid., Geol. Surv. Ala., 1886, Bull, i, p. 56. 

 A^. onusta Dall, Trans. Wag., etc., vol. 3, p. 368. 

 A^. onusta Harris, Bull. Am. Pal., vol. i, p. 232, pi. 22, fig. 17. 



Whitfield' s original description. — See Bull. Am. Pal., vol. i, p. 

 232. 



Dall is inclined to think this is the adult form of aperta. He 

 cites in favor of this idea the facl that "A^. onusta by Whitfield, 

 otherwise identical with his A^. aperta, has the umbilicus plumply 

 filled by a rounded callus. One specimen in the National Collec- 



