O TRANSACTIONS OF THE WAGNER FREE 



the whorls is pretty regularly grooved, in harmony with the incremental lines, 

 by close-set narrow shallow grooves and wrinkles between them ; on the upper 

 whorls in the type specimen there are traces of distinct fine sharp spiral 

 grooves ; the suture is distinct, but not channelled ; the succeeding whorl is 

 uniformly appressed against it and the subsutural line mentioned by Conrad 

 has no expression in the sculpture, but is due to the greater transparency of 

 the silex, as compared with the sandy matrix filling the whorls. The upper 

 whorls are more or less eroded, but the characters are sufficiently distinct. 

 Length of the truncated type lo.o; of the last whorl 7.0; max. width of the 

 shell 4.0 mm. Our largest specimen measures 14 by 6 mm. and an average one 

 13 by 5 mm. ; the aperture 6 by 3.7 mm. 



Habitat, silex-beds of Ballast Point, Tampa, Florida ; collected by Conrad, 

 Dall and F. Burns. 



I have been favored, through the kindness of Prof Heilprin, with the oppor- 

 tunity of comparing and figuring Conrad's original and until lately unique type 

 which forms part of the collection of the Academy of Natural Sciences. 



It differs from the following species in being more elongated and less ab- 

 ruptly tapered at the ends ; it seems also to have had a reflected lip more like 

 that o'i americanus than o{ Heilpriniamts, and without the pronounced inward 

 projection which distinguishes the latter, in the middle of the outer lip. Be- 

 fore comparing them I had supposed that floridanus was merely an immature 

 Heilpriniamis, but when they were brought side by side the difference was pat- 

 ent. I feel quite confident that, so far as the shell affords a criterion, the three 

 species I have mentioned belong to a single section of the genus Bulinmbis. 

 There is nothing remarkable in finding three species of one group in the same 

 local fauna, while one or two closely related species still survive in the vicinity ; 

 and, as we go south, among the Antilles and especially in the northern part of 

 the continent of South America, species of the same section apparently become 

 more numerous and their peculiar features more pronounced. 



The revolving lines are not shown in the figure, as they are only visible on 

 a portion of the back. Over the greater portion of the surface of the siliceous 

 pseudomorph, only the much stronger transverse ridges are perceptible, and in 

 some places even those have been obscured, in the process of mineralization 

 or perhaps by erosion of the original shell before it was replaced by a sili- 

 ceous cast. 



Bulimulus (? Anctus) Heilprinianus n. s. 

 Plate I, figures 6 b, 10. 



Shell small, fusiform, six-whorled ; the spire rather pointed conical; sculp- 

 ture of fine transverse wrinkles with faint spiral stride in places ; suture 

 distinct but not deep, the whorls appressed against it ; base rounded, with 

 a very narrow chink in the umbilical region, but no perforation ; 

 aperture less than half the length of the shell, the lip reflected, thick 

 and solid ; pillar simple, rounded into the base ; body washed with callus con- 

 necting the lips; at the commissure of the body and outer lip a small grooved 



