66 rafinesque's 



last flattened, the other large, with several rows of warts, back of the 

 ^ opening wrinkled. — Length about two-thirds of an inch, not quite 

 double the breadth; colour olivaceous brown, opening whitish. It lives 

 in the lower parts of the Ohio. This genus which contains nearly 

 twenty species of fluviatile shells, was described in my 70 N. G. 

 Animals, &c. I have discovered already about one hundred and 

 eighty species of fluviatile and land shells in the United States. 



[From Enumeration and Account of some remarkable Natural Objects in 

 the Cabinet of Prof. Kaflnesque, in Philadelphia, page 3. Philadelphia, 

 November, 1831. 



[2] 



lY. FOSSIL UNIVALVE SHELLS. 



13. ERPILITES, Eaf. ^. G. or perhaps a S. G. of Trochites. 

 Opening oval, subquadrangular by the end being nearly truncate, 

 columella with a twisted fold and ending with an acute point. All 

 the sp. from tHe limestone and sandstone of Ohio and Kentucky, 

 where other Univalves are very rare.. I have 7 sp. at least, and shall 

 here describe 5 of them. The name means creeping. Although 

 these shells are marine, they appear to approximate very near to the 

 Pleurocera and Meldnia, now living in the Rivers of the same 



, region. 



14. Erpilites Multistriata, Raf. 1818. Suboval, 3 spires with 

 many spiral ribs and minutely striated obliquely. Fine perfect speci- 

 men from sandstone of Knobhills, one and a half inch long, with 

 crystals inside. 



15. Erpilites Platenia, Eaf. 1820. Broad depressed, 3 spires 

 smooth, the first very large with a broad biangular flat raised band, 

 becoming a spiral angle in the other spires. Large sp. two inches 

 broad, silicified, from the limestone. 



16. Erpilites Ohiensis, Raf. 1818. Suboval, 5 spires smooth, 

 each ending by a spiral angle on the upper edge. Limestone of 

 Ohio state, one inch. 



17. Erpilites Garinata, Raf. 1818. Oblong smooth, 5 spires 

 carinated in the middle spirally. Near Lexington in limestone, small, 

 half an inch, seldom petrified. 



18. Erpilites Stenotenia, Raf. 1821. Oblong smooth, 4 or 5 

 spires with a narrow depressed spiral band. Limestone of 

 Kentucky. 



