I02 Dr. W. C. Williamson on • 



Medullary Rays. 

 Tangential. 



C— p. 288, Fig. 13, C.N. 495. Fig. 22, C.N. 495. 



Transverse. ^ 



C— p. 288, Fig. 21, C.N. 503. 



Exogenous Growth : Young Tracheids. 

 C— p. 292-3, Fig. 21, CO. 503. 



Dichotomy. 



C— p. 291, Fig. 20, C.N. 503. 



Halonial form ? 

 See 502. 



Leaf Traces. 

 Hadial. 



C— p. 289, Fig. 10. See C.N. 498. 



Tangential. 



C— p. 288, Fig. 12, C.N. 497. 



Fig. 13, C.N. 495. 



Cortex. 



Excepting its outermost Prosenchymatous and Parenchymatous Zones 

 this structure is but imperfectly preserved in the more matured 

 specimens of L. brevifolium. 

 C— p. 290, Fig. 9i, C.N. 488. Fig. iii, C.N. 4S9. Fig. 16, C.N. 504. 

 Fig. 17, C.N. 505. See also C.N. 501. 



Leaves. Imperfectly preserved. 

 Transverse. 



C— p. 287, Fig. 9. C.N. 488. 



Vertical. 



C. — p. 290, Fig. 15a, C.N. 504. 



Tangential, 



C. — p. 291, Fig. 18, C.N. 506. 



The Adenoid Organ seen in C.N. 480 and the Parichnos in 509. 

 External forms. 



C. — p. 286, Figs. 31 and 32. 



Strobilus, 



Several fine examples have been obtained in the Burntisland or Pet- 

 ticur deposit, and the stratum itself abounds in their microspores. 

 Hence these reproductive organs may be fairly regarded as 

 belonging to the only Lepidodendron also equally abundant. 

 Transverse. 



C— p. 294, Fig. 23, C.N. 520. 



Vertical. 

 Microsporangial. 



C— p. 295, Fig. 24, C.N. 523. Fig. 25, C.N. 295. 



B.B.-p. 26, PI. 8, Fig. 51-52. 



