534 



THE DEVONIAN PERIOD. 



that of the same period in Europe, yet the number of identical species 

 does not seem to be so great as in the coal-fields of the two continents. 

 This may be connected with the different geographical conditions in 

 these two periods; but the facts are not yet sufficiently numerous to 

 prove this. 



7. The above general conclusions are not materially different from 

 those arrived at by Goeppert, Unger, and Brongniart, from a con- 

 sideration of the Devonian flora of Europe. 



The following list includes all the species of the St John beds 

 known up to the present time, the most important of which I shall 

 endeavour to illustrate by short descriptions and figures : — 



I 



Diidoxylon Ouangondianum, Dawson. 

 Sigillaria palpebra, Dn. 

 Stigmaria ficoides (var.), Brongn. 

 Calamites transitionis, Goeppert. 



cannseformis, Brongn. 



Asterophyllites acicularis, Dn. 



latifolia, Dn. 



scutigera, Dn. 



longitblia, Brongn. 



parvula, Dn. 



laxa, sp. nov. 



Annularia acuminata, Dn. 

 Sphenophyllum antiquum, Dn. 

 Pinnularia dispalans, Dn. 

 Lepidodendron Gaspianum, Dn. 

 Lycopodites Matthewi, Dn. 

 Psilophyton elegans, Dn. 



glabrum, Dn. 



Cordaites Robbii, D71. 



angustifolia, Dn. 



Cyclopteris Jacksoni, Dn. 



obtusa, Goeppert. 



varia, Dn. 



valida, Dn. 



Bockshiana, Goeppert. 



Neuropteris Dawsoni, Martt. 



Neuropteris polymorpha, Dn. 



sp. nov. 



probably two other sp. 



Sphenopteris Hceninghausi, Brongn. 



marginata, Dn. 



Harttii, Dn. 



Hitchcockiana, Dn. 



pilosa, sp. nov. 



Hymenophyllites Gersdorffii, Goeppert. 



obtusilobus, Goeppert. 



curtilobus, Dn. 



subfurcatus, sp. nov. 



Pecopteris (Alethopteris)decurrens, Dn. 



( ) ingens, Dn. 



( ) obscura (?), Lesquerenx. 



preciosa, Hartt. 



Perleyi, Hartt. 



serrulata, Hartt. 



Trichomanites, sp. 

 Cardiocarpum cornutum, Dn. 



obliquum, Dn. 



Crampii, Hartt. 



Baileyi, sp. nov. 



Trigonocarpura racemosum, Dn. 

 Antholithes Devonicus, sp. nov. 



{Coniferce.) 



Dadoxylon Ouangondianum* — Dn. Trunks of this fine coniferous 

 tree are frequent in the St John sandstones. They retain their structure 

 in great perfection, especially in silicified specimens. Some of the trunks 

 have been a foot or more in diameter. They show traces of growth- 

 rings on their weathered ends, and when perfect, are traversed by the 

 transversely wrinkled pith-cylinders, formerly known as Sternbergice. 

 Under the microscope the wood-cells are seen to be of remarkable 



* I have named this species after the ancient Indian designation of the St John 

 River, Ouangonda. I use the generic term Dadoxylon as probably best known to 

 English geologists ; but I sympathize with Goeppert in his preference of the generic 

 term Araucarites for such trees. 



