140 PALEONTOLOGY OF ILLINOIS. 



LOXONEMA QUADRI-CARINATUM. Worthen. 

 PL XXIH, Fig. 9-9a. 



Loxonema quadri-carinatus, Worthen, March, 1884. Bulletin No. 2 of the Illinois State 

 Museum of Natural History, page 7. 



Shell long, cylindrical, gradually tapering; volutions eight or 

 more, convex, the last one sloping abruptly to the umbilical 

 region below, and more gradually to the suture above. Volu- 

 tions ornamented with three strong revolving carinse on the 

 lower portion of the volutions, and a less defined one on the 

 upper sloping side below the suture. Transverse lines of growth 

 are visible under a lens on the abruptly sloping under side of 

 the last volution. Aperture ovate. 



Length of a specimen preserving six volutions 13 /io inch; 

 diameter of the lower volution 6 / 1(5 inch. Spiral angle 25. 



Position and locality: Coal Measures, Peoria county, 111. 



Collector, Mr. Gifford. 



No. 2534 of the Illinois State Museum. 



GENUS LEPETOPSIS, Whitfield. 

 LEPETOPSIS CHESTEBENSIS. Worthen. 



PL XXV, Pigs. 1-la, 



Lepetopsis chesterensis, Worthen, March, 1884. Bulletin No. 2, of the Illinois State 

 Museum of Natural History, page 25. 



Shell of medium size, longitudinally ovate, anterior and pos- 

 terior portions regularly rounded and about equal in length, a 

 little broader behind than in front, apex pointed, and directed 

 slightly backward, height equal to about one-third the greatest 

 length; A shallow depression or sinus commences immediately 

 behind the apex and increases rapidly in width the posterior 

 margin. Surface ornamented with numerous somewhat irregular 

 sized concentric lines that arch upward in crossing the sinus-like 

 depression behind the apex. 



Length 9 / 10 of an inch; greatest breadth 7 / w inch; height 

 about 3 / 10 inch. 



This species is related to L. levetti, of the Warsaw beds, but 

 may be distinguished by its more elongate form, and the sinus- 

 like depression behind the apex. 



