303 



on new eran (devonian) plants. 



while the only lycopodiaceous plant which they have afforded is 

 Lep 'telodendron primcev um. 



DESCRIPTION OF THE PLATES. 

 Plate XII. 



Pigs. 1, la. Asteropteris noveboracensis, cross section, natural size and enlarged. 



2. A. noveboracensis, portion enlarged, showing one vascular bundle. 



3. , portion enlarged 12 times, showing rays and vascular bundle. 



4. , stem restored in cross section. 



5, 6. , scalariform vessels, X 100. 



7. , prosenchyma of outer cylinder, X 40. 



8, 9. , parenchyma of inner cylinder, X 40. 



In the above figures, a represents radii of axis, b cellular tissue 

 of axis, c outer prosenchyma. d leaf -bundles. 



10. Equisetides Wright iana, leaf of sheath. 



11. Cyclostigma affine. 



12. , leaf-base, enlarged. 



13. Lepidodendron primeevum. 



14. JEtheotesta devonica, natural size and enlarged. 



Plate XIII. 



15. Dicranophyllum australicum. 



16. , enlarged. 



17. Odontopteris squamosa. 



18. Cardiopteris eriana. 



19. Archcsopteris. sp. n. 



20. Equisetides WrighUana. 



Discussion. 



Mr. Carruthers spoke very highly of the industry of Dr. Dawson 

 in collecting fossils, but he could not agree with him in his con- 

 clusions as to their systematic relations. He thought the form 

 described as a fern should be referred to the Lepidodendroids. 



