1862.] BINNEY SIGILLAEIA AliTD LEPIDODENDRON". 109 



mine. At first sight, it might have been supposed that the specimen 

 of Sigillaria elegans before named had had some of its middle portion 

 destroyed, and that the lunette-shaped bundles once occupied the 

 whole of the central axis ; but having, bj the kindness of M. 

 Brongniai't, been permitted to examine the original specimen pre- 

 served in the Museum of the Jardin des Plantes, it appears to me 

 that the learned author's description of the specimen, as well as the 

 figure in the plate, are both remarkably correct. Although his 

 specimen does not show the external structure of large Sigillarice, 

 my own observations lead me to the conclusion that we shall find the 

 latter very much resembhng, if not altogether identical in structure 

 with, Sigillaria elegans. In large specimens of S. reniformis and 

 S. organum, whose structure is preserved, in my own cabinet, there 

 is distinct evidence of the internal cortical envelope formed of elon- 

 gated cellular tissue or utricles, and disposed in radiating series, in 

 all respects like that described by M. Brongniart in his Autun spe- 

 cimen. 



The longitudinal and tangential sections of my specimen show that 

 the vessels of the central axis and the woody cylinder are barred 

 transversely on aU their sides. M. Brongniart found this to be the 

 case with Sigillaria, and gives it as characteristic of Sigillaria, 

 Stigmaria, and Anahathra^. Specimens of these three, now in my 

 cabinet, clearly prove that their central axes and their woody cyhn- 

 ders are exactly the same in structure and arrangement; thus 

 affording evidence from structure that Stigmaria is the root of Sigil- 

 laria, and that Anahathra is a Sigillaria — which has long been ex- 

 pected would prove to be the case. 



The specimen No. 2, in PI. V., to a great extent resembles JN'o. 1 

 last described, except that it is not so perfect with respect to the 

 outermost cylinder ; but its external characters, its inner bark show- 

 ing the vessels traversing it, its tangential section showing also the 

 vessels traversing the inner cylinder, and some singular delicate ves- 

 sels in the central axis, render it a valuable specimen and worthy of 

 description. 



It is of somewhat larger dimensions than No. 1 specimen, and 

 shows its external characters on one side only of the stem. These, 

 like those of No. 1, consist also of rhomboidal scars arranged in 

 quincuncial order, each scar having on its upper part a comparatively 

 large circular cicatrix, where the leaf was attached. The scar, hke 

 that of No. 1 specimen, most resembles Lepidodendron selaginoides 

 in the rounded figure of the cicatrix left by the leaves, except that 

 it is much larger, occupying the greater portion of the upper part of 

 the surface, whilst that of the latter is scarcely one-fifth of the minor 

 diameter of the scar. In other respects it cannot be distinguished 

 from L. selaginoides figured by Messrs. Lindley and Hutton. 



The internal cylinder is yV^^^ ^^ ^^ inoh. in diameter, and is com- 

 posed of large hexagonal vessels {a a) ; those in the middle being 

 more irregular in shape, placed wider apart from each other, and in 



* Extrait des Ai-chives du Museum d'Histoire Naturelle, p. 424. Paris, 1839 



