Cyrt. 



182 



Cyrtoceras ? Found by Stevenson in the Suhconglom 



erate strata on the anticlinals in the gaps of Westmoreland 

 and Fayette Cos., Pa. (KKK, p. 311.)— X 



Cyrtoceras ? Found by Stevenson in the richly fossilif- 



erous Lower Helderherg strata at Mann's quarry, Monroe town- 

 ship, Bedford Co., Pa. (T2, p. 187) .— VL 



Cyrtolites biloba. See Bellerophon bilobatus. // c. 



Cyrtolites compressus. {Phragmolites compressus^ 

 He. ^^^^ 10 J^ a ' Conrad's Annual Rt., N. Y., of 



1838. Black River and Trent.), 

 Emmons, Amer. Geol. I,ii, 167, 

 plate 12, figs. 10, a, b; flat; 

 whorls slightly compressed and 



P^Q, ms^^^^^^^Mf ^ disjointed ; back sharply keeled, 



with sharp zigzag plates "which 

 only penetrate through the shell." — Irenton limestone iorva-di- 

 tion. lie. 



Cyrtolites expansus. Hall, Pal. N. Y., Yol. 3, 1859, 

 page 479, plate 94, Fig. 4,5 ; shell obliquely depressed-conical ; 

 apex incurved, but making scarcely or no more than a single 

 volution, very rapidly expanding from the apex; aperture 

 nearly circular; surface marked by faint transverse ridges, and 

 finer longitudinal striae. Only two specimens seen by J. Hall, 

 from Albany and Schonarie Cos., N. Y., in the Orislcany, — 

 Specimens (00, p. 235) 702-8 (two) and 703-13, from Royer 

 ridge, Orbisonia, Huntingdon Co. — VII. 



Cyrtolites Mosus. See Cyrtoceras filosum. II c. 

 Cyrtolites ornatus. Rogers, page 821, fig. 619. — Vanuxem 



page 65, 



fig. 9, 2.— 



Emmons, 



page 402, 



fig. Ill, 2. 



— Owens' 



Wise. Iowa 



and Minn. 



(1852) 



plate 2B, fig. 1, from the lead bearing beds on the Mississippi 

 3 m. above Fort Snelling. — Trenton limestone II o. 



