422 Proceedings of the Roycd Physical Society. 



Eemarhs. — The figure shows on each side of the main stem 

 the remains of a small branch ; these are so much narrower 

 than the stem which bears them that they give the fossil 

 an appearance as if it possessed a lateral ramification, but 

 these small branches are evidently the result of an unequally 

 developed dichotomy. On a specimen of this plant from 

 Newsham the same characteristic is exhibited. 



On none of the few examples of Lepidodendron Peachii 

 which I have seen, are the two little oval depressions shown, 

 which in well-preserved Lepidodendroid leaf-scars are usually 

 exhibited, one on each side of the median line immediately 

 below the vascular impression ; but their absence may be due 

 to imperfect preservation. 



Lepidodendron Peachii has a slight resemblance to Lepido- 

 dendron Rhodeanum, Sternberg ; but in Lepidodendron Peachii 

 the lateral angles are more prominent and the upper extremity 

 of the scar much more rounded. The vascular impression is 

 also more central and its angles more prominent. 



The point, however, which at once separates this species 

 from Lepidodendron Rhodeanum is the elevation of the upper 

 portion of the leaf-scar. This is seen in profile at Fig, 66. 

 This peculiar inflation imparts to the leaf-scar a character- 

 istic appearance, which at once distinguishes Lepidodendron 

 Peachii from any other species of Lepidodendron with which 

 I am acquainted. 



Lepidodendron ^Peachii is also related to Lepidodendron 

 minutnm, Sauveur,^ and Lepidodendron Andrewsii, Les- 

 quereux.^ 



The figure given by Sauveur of his Lepidodendron minu- 

 tum shows a fragment of a stem rather less than 2 inches 

 long and about three quarters of an inch wide. The leaf- 

 scars are about 4 millim. long and of about the same width ; 

 in outline some of them are hexagonal, especially towards 

 the lower part of the figure. Notwithstanding, however, the 

 general similarity of Lepidodendron minntum to Lepidoden- 

 dron Peachii, without further evidence than that afforded by 



^Sauveur, "Vegetaux fossiles d. terr. houil. de la Belgique," pi, Ixi,, 

 fig. 3 (1848). 



" Lesquereux, ''Coal Flora of Pemisyl.," p. 389, pl. Ixiv., fig. 6 (1880). 



