FLORA OF THE DEVONIAN. 547 



iiervures. This species, originally described from specimens collected 

 at Gaspe where it abounds in the roof of the little Devonian coal- 

 seam, occurs also at St John, and in the Marccllus Shale of New 

 York; and it has also been found by Sir W. E. Logan in the 

 Upper Silurian of Cape Gaspe, together with fragments of the 

 rhizomes of Psilophyton. It usually occurs as long riband-like 

 detached leaves, not always'easily distinguishable from the flattened 

 stems and roots of other plants found in the same beds. I have not 

 seen the apex nor the base of the leaf, but among Professor Hall's 

 specimens from the Marcellus Shale is one which ajjpears to consist 

 of the remains of several leaves, attached to a short stem, of wliich 

 the structure and markings have perished. 



Plants closely resembling this are described by linger and Gocp- 

 pert, from the Devonian of Europe; but the characters given do not 

 enable me to identify any of them with the present species. Such 

 plants are placed by those writers in the genus Nceggerathia^ which 

 I reject for the reasons above stated. 



[Filices.) 



Cydopteris Jacksoni, Dawson (Fig. 191). " Canad. Nat." vol. 

 vi. p. 173, fig. 9. " Frond bipinnate ; rachis stout and longitudinally 

 furrowed; pinnas alternate; pinules obliquely obovate, imbricate, 

 narrowed at the base, and apparently decurrent on the petiole ; 

 nerves nearly parallel, dichotomous ; terminal leaflet large, broadly 

 obovate or lobed." This species, first described, in my paper in the 

 " Canadian Naturalist," from a specimen found at Perry, occurs also 

 in small fragments at St John, and large specimens occur in the col- 

 lection of Professor Hall from the Old Red Sandstone of Montrose, 

 New York. It is closely allied to C. Hibemica, and is its American 

 representative. It would be placed by many botanists in the genus 

 Adiantites of Brongn., but this name is objectionable in the case of 

 Ferns evidently not related to Adiantian. 



Cydopteris obtiisa, Lesquereux (Fig. 192, A). To this species, 

 described by Lesquereux, from the Old Red Sandstone of Penn- 

 sylvania, I refer a beautiful Fern not unfrequent in the shales near 

 St John. Lesquereux places it in the genus Noeggerathia^ a name 

 applied by other botanists to a very different group of plants. 



Cydopteris valida, Dawson (Fig. 192, B). Tripinnatc ; primary 

 divisions of the rachis stout and wrinkled. Pinnte regularly alternate. 

 Lower pinnules nearly as broad as long, deeply and obtusely lobed, 

 narrowed and decurrent at the base; regularly diminishing in size 

 and breadth toward the point, and the last pinnules narrowly obovate 

 and confluent with the terminal pinnule. Nerves delicate, several 



