PLATE LIV. 

 Lepidodendron Brittsii Lx. 



(Page 188.) 



Fig. 1. Brancblet showing leaves attached. U. S. Nat. Mus., 6042. 



la. Enlarged detail of same to show the bolsters and leaf attachments. x2. 

 2. Fragment from larger branch at the point of bifurcation. The leaf scars are faintly shown. 

 The specimen was determined by Professor Lesquereux. Lacoe collection, U. S ^at JIus 

 5488. ■' 



Lepidodendeon eimosum Stb. var. ketocokticatum D. W. 



(Page 196.) 



Fig. 3. Fragment of cortical impression in which the outer cortex appears to have been longitudi- 

 nally ruptured in elongated diamond-shaped breaks by tlie expanding inner cortex, sepa- 

 rating still further the already distant, linear, fusiform bolsters. U. S. Nat. Mus., 6043. 



3a. Enlarged detail showing linear, elongated bolsters and the transversely rhomboidal leaf 

 scars. x2. 



Si. Single bolster of the same still further enlarged to show the cortical ornamentation and the 



cicatricules of the leaf scar. x6. 

 4. Fragmentary impression of cortex of old trunk in sandstone. The specimen, which was 

 labeled as this species by Professor Lesquereux, shows the distant, greatly elongated 

 bolsters and the complex wrinkling of the bark between the bolsters. Lacoe collection 

 U. S. Nat. JIus., 5280. ' 



4o. Detail, natural size, from the same, to show the features of the leaf scars. .It is hardly 

 probable that the features of the actual outer surface of the scar are here presented. 



Lepidodendeon scutatum Lx, 



(Page 198.) 



Fig. 5. Enlarged detail of No. 6044 photographed in PI. XLV, Fig. 4. It shows the character of the 

 leaf scars and the appendages. x2. 



418 



