100 Commentary on 



I have no doubt Mr. Jukes Avould be niucli surprised to 

 find himself quoted as an authority on Palseontology : he 

 describes himself, in a note, as ignorant of the sub- 

 ject ; and the many errors in that part of his book should 

 not, therefore, be counted against him. But as the Rev. 

 Mr. Clarke has undertaken to overwhelm me with this 

 authority, I suppose I am bound, as a mere matter of 

 courtesy, to return him a few taps with the same weapon. 

 Mr. darkens extract above is from p. 375 of Jukes' Manual, 

 but if he had read his own authority as far as p. 437, he 

 would have found a list of the genera of plants dating 

 their appearance in time from the carboniferous epoch, 

 and that Tceniopteris was not there. If, again, he had 

 continued his studies of his author to p. 462, he would 

 have found a list of the plant genera dating from the 

 Permian, and that T(Bniopteris was not there. If the 

 perusal of his book had extended to p. 466, the list of 

 genera of plants originating in the Trias Avould have been 

 found, again without Tcsniopteris ; and if, finally, he had been so 

 unhappy as to have read to p. 473, he would have found the 

 authority of his own choice distinctly marking Tceniopteris as 

 a genus of plants which commenced and ended its existence 

 ivith the oolitic or Jurassic period. This is probably enough 

 for the present of this authority ; and I Avill now lay before 

 the Society a somewhat better list of the distribution of 

 clearly ascertained species of Taniojiteris (Mr. M'Lelland's 

 two Indian species being omitted, as I have not his report at 

 hand) : — 



Tabular Vieiv of the Geological Distribution of the clearly 

 ascertained Species of the Fossil Genus Tceniopteris. 



T^NIOPTEEIS. 



None fi'om 

 the Coal. 



cy iV. abnot^mis (Gutbier) Uotheliegende, Planitz ; 



p ,~^*- ] Saxony. 



(p. Eckhardi (Germ.) Copper Slate; Mansfeld. 



3. fTr. marantacea (Stern.) Keuper ; Stuttgardt. 

 Keuper. "\_Tr. Schwnleini (Ettingsh.) ; Keuper. 



