CLADOPHLEBIS. 89 
were formerly called Pecopteris, and more recently Cladophlebis ; 
the type of the Jurassic Asplenium being Pecopteris Whitbyensis, 
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).' Schenk has also figured 
fertile pinnules of the same type in the case of an allied form, 
Asplenites Résserti.’ 
1.—Cladophlebis longipennis, sp. nov. 
Type. Pinnee and portion of rachis. Pl. IX. Figs. 1 and 1a. 
Frond bipinnate, pinne long, linear lanceolate, with strong and 
prominent axes; pinnules separate, slightly constricted at the 
base, rhomboidal, nervation of the characteristic Cladophilebis type. 
_ The chief distinguishing marks of this species are the shape 
of the pinnules, and the long gradually tapering pinne. Such 
specimens as occur in the Museum Collection do not throw much 
light on the general habit of the whole frond. 
Dunker’s species,’ Pecopteris Geinitzi7, should be compared with 
the present species; the two agree to some extent in the form 
of the pinnules and venation, but in C. dungipennis the pinne are 
much longer, more tapering and graceful than the shorter and stiffer 
pinne shown in Dunker’s figure. In the much smaller form 
figured by Schenk‘ there is the same kind of likeness in the 
pinnules, and the pinne 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 Dunker. 
Ettingshausen and Debey founded a new genus, Dichymosaurus, 
for the reception of a characteristic type of fern from the Aachen 
Chalk, and defined it as follows® :— 
_ “Sori duo, dorso medio venarum infimarum utriusque lateris 
1 Pl. xxi. figs. 3 and 4. 
2 Fl. foss. Grenz. Keup. Lias, p. 51, pl. vii. figs. 7 and 7a. 
3 Wealdenbildung, p. 6, pl. viii. fig. 3. 
4 Paleontographica, vol. xix. pl. xxix. figs. 2 and 2a. 
5 Denkschr. k. Ak. Wiss. math.-nat. Cl. vol. xvi. 1859, p. 186. 
