FROM THE IIUTTON COLLECTION. 



115 



Remarks. — Brongniart's S. scutellata and not S. pachydermia 

 must be taken as the Typo of this genus. This is clearly enough 

 pointed out by Brongniart himself in the Classification and Dis- 

 tribution of Fossil Plants. 



The Lindley-Hutton fig- 

 ure of their S. pachyderm a 

 is very inaccurately figured, 

 as the annexed Woodcut 

 No. 6 will clearly shew. 

 The Type-specimen is the 

 cast of an inner layer of the 

 cortex, shewing the impres- 

 sions of the inner appearance 

 of the elongated leaf-scars. 



The Fossil Tree, figured 

 originally in the Trans. Nat. 

 Hist. Soc, Vol. I., p. 206, 

 and by Hutton, Foss. Flora, 

 pi. 54, is not, I think, re- 

 ferable to Sigillaria but to 

 Lepidodendron. The smooth- 

 ness of the stem and the 

 markings on the bifurcating 

 root, pi. 54, f . 2, alone prove 

 this. This tree-stem is in 

 the Museum of the Natural 

 History Society. It shews 

 merely the impression of an 

 inner surface of the cortex; 



the surface is either quite ffi'rur &L Woodcut No. 6. " rTms 

 smooth or with a few false ribs here and there, but it has nothing 

 like the true ribs and the apertures for vascular bundles of the 

 leaf-scars, as seen in the stems of old Sigillaria. The pith or 

 medullary sheath, surrounded with a layer of carbonaceous 

 (woody) matter, traversed the length of the stem as far as it 

 could be examined, and seemed to be identical in structure with 

 the central axis of Stigmaria, and was not at all like the pith, 



