1917.] NATURAL SCIENCES OF PHILADELPHIA. 291 



mination of Gabb's species was questioned by Johnson^^ in 1905. 

 The evidences furnished by recently discovered material from Coon 

 Creek shows that these related species from the Ripley do not belong 

 to the genus Nassa but represent a large, undescribed group of 

 magnificent forms which belong to the family Buccinidse. This 

 group is no doubt near Meek's genus Odontobasis.-^ Seminola differs 

 from Odontohasis in having a globose or ovoid form rather than a 

 fusiform outline. Another closely related genus of the Buccinidse 

 is Pseudoliva.-'" Swainson, represented in the Senonian by Pseudoliva 

 zitteli Petho'-'^ from Hungary. .The spiral groove in Pseudoliva occurs 

 well up on the body and is nothing more than a deep spiral sulcus 

 in the sculpture pattern and differs very decidedly from the deep 

 spiral sulcus at the base of the body of Seminola. The Nassidse 

 usually have a crenulate or dentate outer lip and lack the marginal 

 fold on the anterior end of the columella and do not have such a deep 

 spiral sulcus at the base of the body which terminates in a tooth on 

 the outer lip of the aperture. 

 Seminola crassa n. sp. PI. XIX, figs. 6, 7. 



Description. — Shell large and globose; spire low and obtuse, its 

 elevation about one-third the total altitude, whorls six in number 

 and increasing rapidly in size to a much inflated body; sculpture 

 elaborate, axials sharply rounded, coarse and strong; twelve in 

 number on the later whorls of the type, short and retractive, very 

 prominent on the shoulders of the whorls but disappearing abruptly 

 just in front of an undulating sutural band and persisting, though 

 with somewhat diminished strength, to the anterior suture and 

 on the early part of the body to the base; on the final half turn, 

 however, restricted almost entirely to the posterior third; spiral 

 sculpture low and irregular, consisting of a half-dozen equal and 

 equi-spaced coarse and somewhat flattened cords upon the penult 

 and twice as many on the early part of the ultima, secondary spirals 

 are introduced near the base of the first half and these increase in 

 prominence so that toward the aperture, they are almost as strong 

 as the primaries; there are two or three feeble secondary spirals on 

 the sutural band; suture deeply impressed, strongly canaliculate on 

 the later volutions; body constricted posteriorly, sloping rapidly in 



23 Johnson, C. W., 1905, Proc. Acad. Nat. Sci. Phila., p. 23. . 



24 Meek and Havden, 1876, U. S. Geol. Survey of the Terr., Vol. IX, pp. 351- 

 354, text figs. 41. 42, 4.3, PI. 191, figs. 1, a, b, c. 



25 Cossmann, M., 1901, Ess. de Pal. Comp., livr. IV, pp. 191, 192. 



26 Zittel, Text-book of Paleontology, English ed., 1913, Vol. II, p. 556, fig. 1012. 



