340 



PALAEOZOIC TIME — CARBONIFEROUS AGE. 



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

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

 Coal. Sphenopteris tridactylites Brgt. is also from the Lower Coal. Fig. 586, 



Figs. 584-587. 





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

 Hildrethi; 586 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, Sphenopteris 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. 



