128 I^NIOPTEEIS. 



S. — Tseniopteris Dawsoni, sp. nov. 



Type. Portions of simple fronds. In tte British. Museum. Fig. 15. 



In some of the Ttsniopteru 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 vnth "Wealden palseontology. 



It is quite possible that this species may eventually have to be 

 regarded as another variety of T. Beyriehii. 



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 T. %oehingiana ' shows 

 oblique lateral veins, but these spring from the midrib at a more 

 acute angle and have a distinctly curved course, thus differing 

 from T. Bawsoni. As Schenk has pointed out, the fragment on 



Fio. 15 (V. 2729). Fragment of frond of Taniopteris Bawsoni, sp. nov. 



which Ettingshausen's species was founded is in all probability 

 part of a Neuropteris pinnule ; '' at all events it has little claim to 

 be placed in the genus Tceniopteris, 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. 



• Abt. k.-k. geol. Eeichs. vol. i. Abth. iii. No. 2, pi. iii. fig. 19. 

 " Palajontographica, vol. xix. p. 222. 



