817 



P'j:ero. 



Rogers, Geol. Pa. 1858, 

 fig. 657. Hamilton for- 

 mation. Reported b y 

 Ewing(T4, 434), as found 

 in Centre Co., Pa., in the 

 Chemung formation. Re- 

 ported by White (G7,76, 

 229) as found in Columr 

 hia Co. Pa., Hemlock 

 township, 250' below the 

 top of the Hamilton for- 

 mation, VIII g; VIII gf 



Pteronites gayensis, Dawson. Acadian Geology, 1868. 

 '^' page 301, fig. 101, surface covered with rounded 

 concentric wrinkles. Found in the Carboniferous 

 limestone^ Nova Scotia. XTIIf 



Daw. 



Pteronites leevis. {Avicula Icevis.) Rogers' Geol. Pa., 

 VIII.I). 1858, page 827, fig. 662. Hall, Geol. 



N. Y., 1843, page 180, figs. 71,6, Ham- 

 ilton. In Pennsylvania, Columbia Co., 

 Hemlock township (G7, 76, 230) in 

 ^ black slate 20' below top of Marcellus, 

 In Huntingdon Co., between McConnellstown and RR. station, 

 and at the 203d M. post, P. RR., below Huntingdon (T3, 113), 

 in vast numbers at the top of the Marcellus shales ; see specs. 

 191-1, 3, 203, 2, 3. At the Cofi'ee run RR. quarry (p. 12) they 

 lie in Hamilton lower shales. See spec. 190-6. VIII 5, g. 



Pteronites muricatus (Avioula murioata.) Hall. Geology 

 Vni h. oi the Fourth District of New York, 1843, page 180^ 

 fig. 71, 5. Mareellus formation. VIII h 



Pteronites spergenensis. Whitfield, Bulletin No. 3, of 



^^ 1. the American Museum of Natural History, N. Y.^ 



^^-^^ 3 882. Collett's Indiana Report of 1882, plate 30, 



^^^^m fig- 1> view of a left valve, maqniified twiGe, from 



f!Y::^~^^ Spergen hill. Indiana. Sulcarhoniferous. XI. 



