128 T ZNIOPTERIS. 
2.—Teeniopteris Dawsoni, sp. nov. 
Type. Portions of simple fronds. In the British Museum. Fig. 15. 
In some of the Zeniopteris specimens from the Sussex beds 
there is a form of venation which clearly marks them off from 
the previous species. I propose to give expression to this dis- 
tinctive character by the institution of a new species named 
after Mr. Charles Dawson, whose name is already well known in 
connection with Wealden paleontology. 
It is quite possible that this species may eventually have to be 
regarded as another variety of 7. Beyrichit. 
Frond simple, lanceolate, midrib prominent with closely arranged 
lateral veins given off at an acute angle and passing straight to the 
margin without curving or branching. 
The fragment figured by Ettingshausen as 7. zocbingiana! shows 
oblique lateral veins, but these spring from the midrib at a more 
acute angle and have a distinctly curved course, thus differing 
from Z. Dawsoni. As Schenk has pointed out, the fragment on 
Fig. 15 (V. 2729). Fragment of frond of Teniopteris Dawsoni, sp. nov. 
which Ettingshausen’s species was founded is in all probability 
part of a Vewropteris pinnule ;* at all events it has little claim to 
be placed in the genus Zeniopteris, and none whatever to represent 
a new species. 
V. 2729. Woodcut, Fig. 15. 
On the same piece of rock there is a specimen showing the 
gradually tapering apical portion of a frond. 
1 Abh. k.-k. geol. Reichs. vol. i. Abth. iii. No. 2, pl. iii. fig. 19. 
* Paleontographica, vol. xix. p. 222. 
