821 



Ptero. 



Pterophyllum spatulatum, {Pterozamites spatulatus^ 



6 Emmons. American 

 J} Geology, fig. 88.) 

 Fontaine, Monograph 

 U. S. Geological Sur- 

 vey, Vol. 6, page 114, 

 plate 53, fig. 6, a N- 

 Carolina form, be- 

 tween which and the 

 Virginian P. ince- 

 quale^ stands the Ger- 

 man Liassic P. an- 

 draeanum^ Schimper 

 {P. longifolium An. 

 drse) in a transitional 

 ronh ^^^ U.S. Ban. 6 PI. 53 Series.— 2>ms. 



Pterotheca expansa {Delthyris expansa ; m called be- 

 ll T (9 ilSl^ cause supposed to be a 

 n-b ^.^>f^ifMtM^^KI^^msm^ brachiopod; it was on the 



contrary a pteropod shell.) 

 Emmons, page 397, fig. 109, 

 2. Black River and Tren- 

 ton formations, II c. 



Pterotheca {Clioderma) saffordi, Hall. 14th An. Rt. 



18 61, p. 96. 15th 

 Annual Report,1862, 

 plate 8, figs. 15, in- 

 terior view, showing 

 broad septum; 16, 

 cross section, show- 

 ing form and extent 

 of internal cavity? 

 18, lengthwise sec- 

 lion, with outline 

 of margin. Trenton 

 ionnation^ II c. 

 Hall. J^f/vT^ 



