92 Bulletin ii 93 



Lignitic localities. — Ala.: Gregg's and Bell's landings; Tusca- 

 homa, and Lower Peach Tree. 



Specime7i figured. — Gregg's; now. in Paleont. Mus., Cornell 

 Univ. 



Ampullina recurvavar. PI. 12, fig. i. 



Syn. Natica mississippiensis Heilp., Proc. Ac. Nat. Sci. Phila., 1880, p. 



365. Name in list only. 

 Natica mississippiensis (umbilical variety) Aid., Geol. Surv. Ala., 



Bull. I, p. 56. 

 Natica recurva Aid., idem, 1886. p. 33, pi. 5, fig. 10. 

 Natica dumblei Heilp.. Proc. Ac. Nat. Sci. Phila., 1890, p. 404, pi. 



II. fig. 3- 

 Ampullina crassatina var. mississippiensis (in part) Dall, Trans. 

 Wag., etc., vol. 3, p. 375. 



Aldrich's original description. — "Shell large, globose, smooth, 

 whorls six, spire low; suture channeled, that part of the whorl 

 within this groove concave, rising to a shoulder. Body whorl 

 very large, flattened on upper part, abruptly rounded below the 

 umbilicus; aperture semilunar, rounded anteriorly and narrowed 

 at the posterior part; callus thick, spreading over the body whorl 

 and partially covering the umbilicus. Umbilicus large, 

 deep, striated within, a thickened callus or rib proceeding from the 

 lower edge of the outer lip, and rounding into the umbilicus. 



''Locality. — Lisbon, Ala. The type shows on the body whorl 

 traces of numerous revolving color lines. ' ' 



' With all of Conrad's types before me I cannot see how our 

 Lignitic specimens can be referred to N. mississipiefisis Con. 

 The latter species is smooth exteriorly, showing almost no traces 

 of growth lines; pradlically no umbilicus, and what there is, is 

 obliterated by the labial callosity; no sign of the "thickened 

 callus or rib proceeding from the lower edge of the outer lip and 

 rounding into the umbilicus," as mentioned under recurva. 



The Lignitic variety of recurva is generally smaller than the 

 type specimen. The "rib" just referred to does not generally 

 make quite so wide a sweep, but proceeds more diredlly up into 

 the umbilicus in the varietal form. A^. rectirva varies greatly at 

 its type locality so far as suture channeling and height of spire 

 are concerned. 



