CLADOPHLEBIS. 89 



were formerly called Pecopteris, and more recently Cladophlebi* ; 

 the type of the Jurassic Asplenium being Pecopteris Whitbyemis, 

 Brong. He figures in support of this wholesale removal to 

 Asplenium fragments of fertile pinnules which, so far as the 

 figures indicate, possess a similar arrangement of sori to that of 

 Asplenium (sub-genus Diplazium}. 1 Schenk has also figured 

 fertile pinnules of the same type in the case of an allied form, 

 Asplenites Rosserti? 



1. Cladophlebis longipennis, sp. nov. 



Type. Pinna? and portion of rachis. PI. IX. Figs. 1 and la. 



Frond bipinnate, pinna? long, linear lanceolate, with strong and 

 prominent axes; pinnules separate, slightly constricted at the 

 base, rhomboidal, nervation of the characteristic Cladophlebis type. 



The chief distinguishing marks of this species are the shape 

 of the pinnules, and the long gradually tapering pinna?. Such 

 specimens as occur in the Museum Collection do not throw much 

 light on the general habit of the whole frond. 



Bunker's species, 3 Pecopteris Geinitzii, should be compared with 

 the present species; the two agree to some extent in the form 

 of the pinnules and venation, but in C. lungipennis the pinna? are 

 much longer, more tapering and graceful than the shorter and stiffer 

 pinna? shown in Dunker's figure. In the much smaller form 

 figured by Schenk 4 there is the same kind of likeness in the 

 pinnules, and the pinna? approach more closely to those of the 

 English species, but, on the whole, there is not sufficient reason to 

 include the latter in the North German form as defined by Duuker. 



Ettingshausen and Debey founded a new genus, Dickymosaurus, 

 for the reception of a characteristic type of fern from the Aachen 

 Chalk, and defined it as follows 5 : 



" Sori duo, dorso medio venarum infimarum utriusque lateris 



1 PL xxi. figs. 3 and 4. 



2 Fl. foss. Grenz. Keup. Lias, p. 51, pi. vii. figs. 7 and 7a. 



3 "Wealdenbildung, p. 6, pi. viii. fig. 3. 



4 Palaeontographica, vol. xix. pi. xxix. figs. 2 and la. 



5 Denkschr. k. Ak. Wiss. math.-nat. 01. vol. xvi. 1859, p. 186. 



