APPENDIX. 



Since 1863, when my report was delivered, I have had 

 opportunity to examine a large number of specimens, found in 

 the iron concretions of Mazon creek, near Morris, Grundy 

 county.* As the species of a certain locality, compared with 

 the number of specimens in which they are represented, give 

 us a pretty fair insight into the vegetation of the coal epoch, 

 at least for a peculiar horizon, it may be interesting to have 

 enumerated in a table all those which, to my knowledge, have 

 been found in that remarkable locality. 



No. of spec. 

 1. Neuropteris hirsuta, Lsqx 120 



2. 

 3. 

 4. 

 5. 

 6. 

 1. 

 8. 



Clarksoni, Lsqx 1 



flexuosa, Brgt.f 1 



plicata, Sternb 1 



Loschii, Brgt 4 



vermicularis, Lsqx 2 



tenuifolia, Brgt.J 2 



rarinervis, Bunb 16 



No. of spec. 



9. Neuropteris Desorii, Lsqx 1 



10. " fimbriata, Lsqx.g 1 



11. " Evenii, Lsqx 2 



12. " pachyderma, Lsqx...... 2 



13. " inflata, Lsqx 2 



14. " verbensefolia, Lsqx.||... 4 



15. Odontopteris Wortheni, Lsqx 3 



16. " subcuneata, Bunb.... 4 



* Especially in the cabinet of Prof. J. D. Dana, of New Haven, of Schenectady Col- 

 lege, and of Mr. Even, at Morris; this last remarkable indeed for the number and 

 beauty of the specimens. 



■f An obscure specimen only; it may be a large form of Neuropteris Loschii. 



\ This species is abundant in the shales above and below the upper coal at Morris, 

 and also at Colchester. 



§ A fine specimen of this species, with alternate leaves attached to the rachis. This 

 species, rare in Illinois, is common in the iron concretions between Athens and Mari- 

 etta, Ohio, at the same horizon. 



|| From specimens in Mr. Even's cabinet at Morris. The species appears bipinnately 

 divided; the alternate leaflets of the same form as the one described and figured in 



