426 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



cliaracteristic of the genus, are scarcely ever more than twice forked ; 

 indeed, in many of the smaller leaflets, only once. Thus, in respect 

 of its venation, this plant is really intermediate between the genera 

 Neuropteris and Pecopteris ; but its habit is altogether that of a 

 Neuropteris^ and its leaflets are attached to the stalk in the manner 

 characteristic of that genus. 



The frond is bipinnate ; the main stalk striated, and rather slender 

 in proportion ; the pinnae partly opposite and partly alternate, nar- 

 row and almost linear in their general outline. Leaflets closely set, but 

 not usually overlapping, oblong, rounded at the end, slightly waved 

 at the edges, oblique and somewhat dilated at the base, where they 

 are more or less auricled ; they are convex, and appear to have been 

 of a firm consistence ; their surface smooth and shining. In length 

 they vary from j to ^ inch, those of the lower pinnae being in general 

 the largest and of the most elongated figure. The veins are strong 

 and prominent. Towards the top of the frond the leaflets run into 

 one another, so that the pinnae become merely sinuated, and a few of 

 the uppermost of all are completely undivided. 



Of the species of Neuropteris hitherto described, the one that 

 comes nearest to this is the N. attenuata of the ' Fossil Flora,' 

 tab. 174. The veins in that Fern, though not noticed in the de- 

 scription, appear by the figure to resemble those of our plant ; but 

 there seems to be a suflicient difference in the terminal leaflet, which 

 in ours is larger than the others, and somewhat halbert-shaped, 

 whereas in the N. attenuata it is represented as smaller than those 

 next to it. The present species is a larger plant altogether than the 

 attenuata appears to be, and its leaflets do not diminish so remark- 

 ably in size towards the extremities of the pinnae. 



7. Neuropteris . 



A small fragment, which appears diiferent from any described 

 species, but is insuflicient for a satisfactory determination. It is a 

 terminal leaflet, of an elongated lanceolate form, about 1 1 inch long, 

 convex, and apparently of a thick and firm texture ; the venation 

 similar to that of N. cor data. It is not impossible that it may belong- 

 to one of the modifications of that most variable plant. 



8. Cyclopteris OBLiauA? {Ad.Bro7i(/n.Veff.Foss.22\.t.6\A.3'l) 



A single specimen, very much resembling the British C. obliqua, 

 but of a form more nearly circular ; probably however only a variety. 



9. Odontopteris Schlotheimii. {Brongn. Veg. Foss, p. 256. 

 t. 78. f. 5.) 



A single specimen, agreeing well with Brongniart's figure, except 

 that the veins are disposed in a somewhat more radiating manner, and 

 some of them appear to be more than once forked ; they are less di- 

 stinct in this specimen than in his figure. 



The only locality, hitherto known, for Od. Schlotheimii was Manne- 

 bach in Germany, where it was discovered by M. Schlotheim. 



