70S MR. W. CARRUTHERS ON FOSSIL CYCADEAN STEMS. 



V :. 2. TransveoK section of the same specimen, showing the pith, the wood cylinder, the bark, and the 



bases of the petioles. 



Plate LXIII. 



Vie. 1. 



Mantellia nidift 



From a specimen from 



land, in the British Museum. In the upper portion of the specimen th< 

 and the large meshes in it through which the vascular bundles passed. 



shown 





- . 



ie upper surface of M. inclusa, Carr., showing the pith, the size and position of the wood 

 cylinder, which has perished, the pith everywhere penetrated by the ascending vascular bundles 

 belonging to the petioles, and the petioles. The specimen was found at Potton, Cambridge- 

 hire, and is in the collection of W. Reed. Eso.. F.O.S.. Ynrk 



if;. Outer surface 



Pig. I Several petioles of M. intermedia, Carr., from a specimen from the Isle of Portland, in the British 



Museum. 



• 



I ig. 5. Portion of the wood cylinder of the same species, showing the number and size of the meshes. 



British Museum. 



Museum 

 M. microphylla, Miq., from a specimen from 



POSTSCRIPT. 



a !i the kindness of Principal Dawson I have seen a photograph of one of the 

 < ycadean stems found by P. Tyson, Esq., in Maryland, referred to on p. 679. The sped- 



>'■ ■ Iron, which it was taken was fifteen inches in height. It is obviously a species of 



Be Hide,, wrfh smaller leaf-sears than those in B. Saxbymuw. Numerous axillary 

 ■■ "cues are seen, some of which are hollow in the centre from the fruits having 



Ot. Dawson informs me that Mr. Tyson regards the beds in which he obtained 

 the specimens as most probably of Wealden age. 



i>hc 



