1862.] 



DAWSON DEVONIAN PLANTS: 



327 



Geological and Oeographical Distribution of the Devonian Plants of 

 Eastern America (continued). 



1 



Names of Species. 



Upper 

 Silu. 

 rian. 



1 

 O 



Lower 

 Devo- 

 nian. 



Middle 

 Devonian. 



1 



Upper 

 Devonian. 



§ 



.a 



6 



a. 



1 



1 



i 



J 



s 



a 



1 

 I 



2; 



.2 



c 

 c 



42. Cyclopteris Jacksoni 













* 



* 



* 







43. obtusa 













* 





44. valida 















45. varia 



















46. Brownii .... 













* 







47. incerta 









* . 









48. Neuropteris serrulata 













* 

 * 



* 







49. polymorpha . . . 



















50. Sphenopteris Hoeninghausi ... 

















* 

















52. Hartii 































¥! 







54. Hymenophyllites curtilobus 













* 



* 



* 







55. obtusilobus 



















56. Gersdorffii 

















* 



57. Alethopteris decurrens 















58. ingens 















59. obscura ? 

















#? 



60. Trichomanites 















61 . Ehachiopteris pinnata 





















. ¥r 











63. punctata 



















64. striata 









* 



^\ 









*? 



65. tenuistriata 



66. Cardiocarpum cornutum 









1 















•Sf- 

 * 

























68. Trigonocarpum racemosum . , 



















69. Acanthophy ton spinosum 

























\" 













III. Conclusion. 



In the course of the preceding pages, I have endeavoured to notice 

 points of general geological and botanical interest as they occurred ; 

 and it will now be necessaiy only to mention a few leading results, 

 as to the Devonian Flora, which may be deduced from the observa- 

 tions above recorded. 



1. In its general character the Devonian Flora resembles that of 

 the Carboniferous Period, in the prevalence of Gymnosperms and 

 Cryptogams ; and, with few exceptions, the generic types of the two 

 periods are the same. Of thirty-two genera to which the species 

 described in this paper belong, only six can be regarded as peculiar 

 to the Devonian Period. Some genera are, however, relatively much 



