93 LiGNiTic Stage 93 



Lignitic localities. — Ala.: Hatchetigbee; Woods bluff; Bell's 

 landing; Yellow bluff. Gregg's landing also. — Aldrich. 



Variety figured. — From Hatchetigbee; Lea Memorial Collec- 

 tion. 



Sigaretus declivus, PI. n, fig. 30. 



Syn. 5*. declivus Con., Foss. Sh. Tert., etc., Nov. 1833, p. 45. 



Natica striata (in part) of Lea, Cont. to Geol., Dec. 1833, p. 105, 



pi. 4, fig. 88. 

 Catinus bilix var. diclivus Con., Am. Jr. Conch., vol. 6, p. 314, pi. 



13, fig. 2, 1S70. 

 5'. declivus Dall, Trans. Wag., etc., vol. 3, p. 378. 



Conrad'' s original description. — "Obliquely suboval, with 

 distindl impressed and intermediate fine striae; spire slightly prom- 

 inent; umbilicus small, partly closed by the callus; aperture 

 patulous." Claiborne, Ala. 



Lignitic localities . — Ala.: Woods bluff; Bell's landing; Gregg's 

 landing. 



Type.—KQ.2i^. Nat. Sci., Phila. 



Specimen figiwed. — Woods bluff; Paleont. Mus. , Cornell Univ. 



Sigaretus bilix, PI. n, fig. 31. 



Syn. 5. bilix Con., Am. Jr. Sci., vol. 23, p. 344, Jan. 1833. 

 Natica striata Lea, Cont. to Geol., Dec. 1833, p .105. 

 Catinus bilix Con., Am. Jr. Conch., vol. 6, p. 314, pi. 13. fig. 4, 



1870. 

 Sigaretus bilix Dall, Trans. Wag., etc., p. 378 of vol. 3. 



Conrad's original description. — "Shell obliquely oval, convex, 

 with fine crowded striae revolving in pairs. Length, one-third of 

 an inch. 



"^ Locality. — Claiborne, Ala. London Clay." 



So far as our observation goes Dall is correct in retaining both 

 names bilix and declivns as of specific rank. Lea, and afterwards 

 Conrad, referred the two to the same species, though Conrad still 

 retained declivus as a varietal designation. Bilix is rotund; de- 

 clivus is obliqite. So far we have had no trouble in separating 

 the two species. 



