94 Rev. W. B. Clarke's Communications on 



allow me to defer to another time the discussion in full of 

 the subject of it^ 



I have the honor to remain. 

 My dear Sir, 

 Your Excellency's faithful servant, 



(Signed) W. B. Clarke. 



His Excellency Sir Henry Barkly, K.C.B. 



P.S. — I have written the foregoing in haste ; but if any 

 discussion arise at the Eoyal Society, to which my friend Dr. 

 Miiller wishes me to contribute a paper on the subject of the 

 coal formation, and if your Excellency please, I have no ob- 

 jection that what I have written should be made use of. It 

 might serve to foreshadow some points in the argument. 



In my letter I have not alluded to Virginia ; but on 

 reference to Mr. Bunbury's description of Tceniopteris magni- 

 folia, brought by Mr. Lyell, and on which stress is laid, I 

 find he considers it in some respects akin to the living 

 Oleandra pilosa, Avhich justifies what I have said before ; and 

 I think his description of the neuration agrees very nearly 

 with that of the plant I mentioned from Ofen, near Bruns- 

 Avick, and that also from my Wianamatta beds of Paramatta. 

 (See what he says, Q. J. III., 281, 287.) 



Nor have I said anything of India. But if we refer to 

 M'Clelland's figures— (Report, 1850, t. XV., XVI.,) we shall 

 see that his T. spatulata and T. acuminata are not Taniopteris ; 

 and his third species, T. danceoides, as defined by Goppert 

 (p. 352), is an As])idites. 



The bearing of the reference to Aspidites is this : that it is 

 a genus which is not confined to the Jurassic epoch ; and one 

 species called T. vittata belongs to the Keuper. This last 

 formation has more to do with us than some think. 



Tseniopteris. 



I. (A Brongniart Hist, des Veg. Foss., tom I., p. 262.) 

 (1.) Folia simplicia, integerrima. 



(2.) Nervo medio crasso rigido. 

 (3.) Nervulis perpendicularibus. 

 (4.) Vel BASi furcatis. 



Fructificatio punctiformis. 



II. (Goppert Die Fossilen Farrnkrauter, p. 58.) 

 (1.) Frons simplex — integerrima. 



