L, Lesquereux on the Coal Formations of the United States. 199 
leaflets supporting them has been destroyed by maceration ; 
but there is no trace of any such substance and the sporanges 
course this can not change the views expressed above, 
concerning the classification of the fossil ferns, but only force 
€ admission of one or more of those artificial and unreliable 
genera, which may be eliminated by the discovery of better 
Pekan and with which fossil botany has to be satisfied for 
€ present. 
Ist Tribe. Neuropteridec. 
es seems to necessitate 
this tribe admitted by 
Sternberg, Vers. p. 28 for the description of the figure of fn 
Plate 20th ; then us : 
efinitively page 86th of his 4th book where he li 
the genus of uncertain affinit 
