72 TRANSACTIONS OF THE WAGNER FREE 



Fulgur maximus. 



Conrad, Fossils of the Medial Tertiary Formations, pi. 47, not described-. 

 Gill, "On the Genus Fulgur and its Allies," Am. Journ. Conch., iii, p. 46 (enumera- 

 tion of species only). 



Shell sub-pyruliform, with a short scalariform spire ; spiral whorls 

 about five, convex, slightly hollowed above the middle, the upper two or 

 three gently carinated and crenulated. 



Body-whorl ventricose, somewhat concave on the shoulder, which 

 supports a number of irregularly placed, and not clearly denned nodules ; 

 longitudinal lines of growth well-marked, disfiguring the surface of 

 the shell ; an irregular swelling near the base of the whorl ; aperture 

 nearly four-fifths the length of the shell, oval above, produced into a 

 broad and open arcuate canal ; outer lip striated internally. 



Columella sigmoidal, its surface covered with a thin callus; columellar 

 fold nearly obsolete. The entire surface of the shell covered with nu- 

 merous slightly wavy revolving lines' which in a measure alternate in size. 



This species, in its typical form, cannot readily be confounded with 

 any of its immediate congeners ; the absence of well-defined tubercles 

 serves to distinguish it almost at a glance. But the incipient nodulation 

 seen in some, or most of the specimens, becomes much more sharply 

 defined in others, and, indeed, advances with such gradational steps that 

 a continuous passage is led up to the prominently tuberculated F. Tritonis 

 (Conrad, Proc. Acad. Nat. Sciences, 1862, p. 583), from the Miocene of Vir- 

 ginia, and from this again, by insignificant changes, to F. filosns (Proc. Acad. 

 Nat. Sciences, p. 286), from the same series of deposits. The gradation 

 is absolute, and permits of no natural separation of the different forms 

 here indicated. Whether or not, therefore, these forms are to be regarded 

 as distinct species, or as varieties representing but a single species, with 

 well-marked characters defining the extreme forms, is of little moment. 

 That they are modifications of, or derivatives from, one and the same 

 form, there is, it appears to me, very little doubt. 



This species I identified among the fossils of the Caloosahatchie by a 

 limited number of specimens. The largest of these, which measures 

 upwards of five and a half inches in length, is absolutely undistinguish- 

 able in character from the Miocene fossil. 



Fnlgnr central-ills, Conrad. 



Am. Journ. Science, xxxix, p. 387; Fossils Medial Tert. Form. U. S., pi. 45, fig. 11. 

 Busycon perversum, Emmons, North Carolina Geol. Rept. p. 249, fig. 107. 



Common in the banks of the Caloosahatchie, below Fort Thompson. 



This shell has the general character of Fulgur rapum, from which it 

 diners in being sinistral. Dr. Gill, in his review of the genus Fulgur 

 (Am. Journ. Conch., iii, p. 144), remarks that in the greater number of 

 sinistral shells the form is not more obliquely wound than in the dextral, 



