378 TRANSACTIONS OF THE WAGNER FREE 



pressed, smaller and more callous around the aperture. The other species 

 from Ballast Point has no channel in front of the suture and a much less 

 callous aperture. 



Polynicee (Amauropsis) Guppyi Gabb ? 



Amaura Guppyi Heilprin, Trans. Wagn. Inst. i. p. 112, 1887. 



? Amaura Guppyi Gabh, Trans. Am. Phil. Soc. xv. p. 224, 1873. 



f Natica phasianelloides Guppy, Quart. Journ. Geol. Soc. xxii. p. 219, pi. 17, fig. i, 1866. 



Older Miocene of the Orthaulax bed at Ballast Point, Tampa Bay, 

 Florida, Dall and Willcox. 



Gabb says of his species that the spire is two-thirds as long as the mouth, 

 and that the whorls are rounded, neither flattened nor channelled near the 

 suture. He also says that Guppy 's figure is a little smaller than the average 

 of the full-grown specimens. Guppy's figure shows the whorls rounded and 

 without any channel or turriculation. 



In the Florida shell, all the specimens examined have the whorl in front 

 of the suture distinctly flattened, and the spire averages about one-half of the 

 length of the mouth. The average size is comparatively larger than Guppy's 

 figure, though this is not very important. Still, these differences suggest a 

 misidentification, as Professor Heilprin had only one specimen for comparison. 

 If the species prove distinct from the Antillean shell, it may take the name of 

 floridaiius. 



It may be noted that Bulinius livinceiformis Meek and Hayden, of the 

 Fort Union Lignitic group, has a very close resemblance to the elevated 

 forms of Amauropsis or Amaura, suggesting a doubt as to its generic place. 

 Amaura tornatelloides Meyer, from the Claibornian, is probably not an Amaura, 

 and may be an Oiioba. 



Genus SIGARETUS Lamarck. 



This group is represented in our Tertiary from the Eocene onward by 

 species of Eunaticina, as well as typical Sigaretiis. 



In the Eocene we have 5. bilix Conrad (-i- striata Lea), which is a conical, 

 almost naticoid, species very abundant in the Claibornian, and found also in 

 Lee County, Texas, at Wood's Bluff, Ala., and Red Bluff, Wayne County, 

 Miss. It is represented in the Jacksonian and Vicksburg group, where it was 

 named mississippiensis by Conrad. At first I supposed that the Vicksburg 

 form might be varietally separated from that of Claiborne by having a some- 

 what smaller umbilical opening, and, in general, perhaps this is true; yet in 

 examining a large quantity of Claibornian specimens, I find the umbilicus 

 varying quite as much among them as the most extreme Vicksburg specimens 

 do from the average Claibornian. 



Another form is well represented in the Claiborne sands, which was 

 named 5. declivis by Conrad. It is readily separated from 5. bilix by its more 

 depressed form, a wide emargination of the pillar, and the roofing over at the 



