340 



PALAEOZOIC TIME — CARBONIFEROUS AGE. 



phyllites, and several of Alethopteris, Neuropteris, and Pecopteris, are found in 

 the lower division. Fig. 585, Alethopteris Lonchitidis, exclusively of the Lower 

 Coal. Sp>henopteris tridactylis Lsqx. is also from the Lower Coal. Fig. 586, 



Figs. 584-587. 



m 



Fig. 584, Odontopteris Schlotheimii ; 585, Alethopteris Lonchitidis; 586, Hymenophyllites 

 Hildrethi ; 58G a, portion of the same, enlarged ; 587, Sphenopteris Gravenhorstii ; 587 a, 

 portion of the same, enlarged. 



Hymenophyllites Hildrethi, from the Kanawha Salines, and 586 a, the same, en- 

 larged; fig. 587, SjiJienopieris Gravenhorstii, common in Ohio and farther west, 

 at the Gate Vein, Pennsylvania, and occurring also in England and Silesia; 

 587 a, a portion of the same, enlarged. 



The genus Noeggerathia, a Devonian species of which is figured on p. 291, 

 occurs in the Lower Coal measures alone. Fig. 587 A, Noeggerathia minor 

 Lsqx., from Pennsylvania. 



