458 



GENERA INCERTAE SEDIS 



[CH. LI 



except at the base (fig. 816); the lamina is abruptly narrowed and 

 attached by a short and slightly twisted stalk. Though apparently 

 inserted laterally the leaves are in all probability spirally disposed. 

 In one of Fontaine's figures there is a group of small scars, fig. 816, & 9 

 presumably of bud-scales, at one place on the axis. This species 



FIG. 816. Nageiopsis longifolia. (A, after Fontaine; nat. size.) 



is very abundant in the Potomac beds of Virginia and Maryland 1 

 and is recorded by Fontaine from several other localities though 

 for the most part on slender evidence. 



Nageiopsis zamioides Fontaine. 



In this species 2 the leaves are ovate-lanceolate and shorter than 

 in N. longifolia', they have a maximum breadth of 2cm. and 

 reach a length of 7 cm. The example described from English 

 Wealden beds as Nageiopsis sp. cf. N. heterophylla agrees closely 

 with Fontaine's Potomac species. 



1 Fontaine (89) B. p. 195, Pis. LXXV. LXXIX. ; LXXXV.; Berry (11) p. 384. 



2 Ibid. p. 196, Pis. LXXIX. LXXXI.; Berry (11) p. 386, Pis. LXII., LXIII. 



