DESCRIPTION OF SPECIES. PP. 35 



represented, only a few specimens being found in tlie entire 

 mass of material at the localities which afford thousands of 

 examples of other plants. Above the Waynesburg Coal we 

 do not certainly find any Calamites. 



Calamites Suckowii, Brongt. 



This species is found very sparingly at the horizon of the 

 Waynesburg Coal, at Cassville and West Union. It does 

 not differ from the typical form, except perhaps in the 

 greater flatness of the ribs. 



NeTnatopliyllum, gen. nov. (I'lj^a, thread, oUw^ leaf.) 



Stem covered with a thick, very finely striate epidermis ; 

 internodes rather remote, swollen ; leaves verticillate, nu- 

 merous, very long and thread-like, of equal width through- 

 out, finely striate, without nerves, united at the base, in a 

 narrow annular band. 



We have found it necessary to form a new genus to in- 

 clude the plant figured on PL II, Figs. 1, 2, 3, 4, 5, since 

 it cannot properly be placed under Aster ophyllites^ (Cala- 

 mocladus, Schimp) lacking some of the essential features 

 of that genus, especially the ridged stem and leaves with 

 mid rib. This genus is defined by all the authors as con- 

 taining leaves free to the base, and furnished with mid rib. 

 Heer, in his Pfl. d., Steink. Per. d. Schw. p. 50, decribes a 

 23lant under the name of Asterophyllites longifolius, which 

 would certainly not seem to be an Asterophyllites, but 

 agrees closely with our genus. Again, Heer in Plf. d. Trias 

 u. Jura, p. 78, describes under the name of ScJiizoneura 

 Merlani. another species, which is not known to possess 

 the essential feature of Schizonura, viz : union of the leaves 

 at some stage of growth. This plant has nearly all the fea- 

 tures of our genus, and most probably should be included 

 in it. 



Nematophyllum angustum, Sp. nov. PI. II, Figs. 1-5. 



The specific character of this plant is that of the genus, 

 with the addition that the number of leaves is from 10 to 20, 



