XIX APPENDIX. 



with short, sublanceolate, regularly alternating, rather crowded 

 pinnse, directed nearly at right angles to its sides. Pinnules simple, 

 alternate, very obtuse, and varying from subcircular to obovate, 

 those nearest the rachis being sometimes nearly circular, and 

 connected with the rachis by an extremely short petiole, or almost 

 sessile ; those further out narrower, more oblique, and tapering 

 to a narrow base that is more or less decurrent on the rachis j 

 terminal one sometimes a little larger than the smaller of the 

 others, and partly confluent with the nearest of the latter. 

 Nervation moderately distinct ; nerves spreading from the base, 

 and bifurcating two or three times. 



This is probably a smaller species than either of the other two 

 already described, and is very distinct from them both in the 

 form and simplicity of its pinnules. But the single imperfect 

 specimen of it figured was found, and it occurred directly asso- 

 ciated with the others. In the form of its pinnules and their 

 nervation it resembles Arch ssopferis {Noeggerathia) minor, of 

 Lesquereux, but its pinn^ and pinnules are much more crowded 

 and shorter. 



For the reasons already explained, future corrections of nomen- 

 clature may require the name of this species ts be written Adian- 

 tites (^Asplenites) AUeghanensis, or Falseopteris Alleghanensis. 



(44) 



