88 Bulletin ii 88 



more or less striate above and below. Eonaticina is by definition 

 a sharp-spired, thin shell. 



Localities. — Ala.: Chodlaw corner; Woods bluff; 4 mi. above 

 Hamilton bluff, Ala. river; Hatchetigbee. 



Tex.: Sabinetown. 

 Type. — Aldrich's colle<5lion; from Chodtaw corner. 

 Speciinen figured. — Hatchetigbee; Paleont. Mus., Cornell Uni- 

 versity. 



Natica eminula var. PI. n, fig. 22. 



Syn. N. eminula (See Bull. Am. Pal., vol. i, p. 233). 



N. parva var., Aid., Geol. Surv. Ala., Bull, i, p. 56. 

 N. decipiens Aid., Geol. Surv. Ala., Bull, i, p. 56. 

 ^V. eminula Aid., Geol. Surv. Ala., Bull, i, p. 58. 



This form differs considerably from true eminula from the 

 Claiborne sands, but its general form and appearance is such as 

 to suggest a close relationship to the latter. A^. eminula at Clai- 

 borne differs somewhat in its proportions, but it is generallj' 

 thin, with only a slight tendency to form a columellar callosity. 

 This form is thicker, wider in proportion to its height; with a 

 callosity showing an indentation or notch above— a charadleristic 

 which, however, I have noticed in Jackson specimens from White 

 bluff, Ark. These differences are probably due to difference of 

 environment. These differential charadleristics are carried 

 slightly further in A^. marylandica Con.; i. e., marylandica is 

 lower or wider than the Lignitic specimens of the South and are 

 apt to have a larger umbilicus. A^. marylandica, too, sometimes 

 attains a larger size than any of its southern representatives. If 

 marylandica were the older name I would be inclined to place 

 this Lignitic form as a variety of that species, for the inter-re- 

 lationship of the two is close and well marked. 



It is fortunate that eminula and viarylandica were proposed for 

 the extremes of the series if the names are to be employed as de- 

 noting distin(5l species. But this leaves us in doubt abojit the 

 proper nomenclature of these intermediate forms. 



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

 low bluff; Bell's landing; 4 mi. above Hamilton bluff; Hatche- 

 tigbee bluff; Tuscahoma landing; near mouth of Bashi creek. 



