ii8 Dr. W. C. Williamson on • 



Spores. 



I.— pp. 341-3, Figs. 39a to S2a. 

 I.— Fig. 57g,g,g, C.N. 631. 

 BB. — p. 25, Figs. 43a, 44a, 45a, 47a, 48a,49, C.N. 6246. 



Longitudinal Sections. 

 Medulla. 



Q. — p. 199, Fig. 22a", C.N. 419c. 



Primary Tracheal Cylinder. 

 Q. — p. 199, Fig. 2ia, C.N. 419c. 

 Q. — p. 199, Fig. 22aa"', C.N. 419c. 



Leaf-Traces. 



Q. — p. 199, Fig. 2ia, C.N. 419c. 

 Q.— p. 199, Fig. 22a', C.N. 419c. 



Strobilus. 



Primary Xylem Strand. 



Transverse Sections. 

 Medulla. 



K. — p. 502, Figs. Iia and 12a, C.N. 624. See also 6246. 



Primary Tracheal Cylinder 



K. — p. 502, Figs. lib, 12b, C.N. 624. See also 624e. 



Longititdiital. 



BB.— p. 25, Fig. 50b, C.N. 624b. 



Cortex of Twigs and Strobili. 

 Middle. Transverse Sections, 



K. — p. 501, Figs, iicand I2cl, C.N. 624. 

 Q.— p. 199, Fig. I9e, C.N. 419b. 



Outer. 



I-— P- 347, Fig. 53b, C.N. 626. 

 K.— p. 501, Fig. I id, C.N. 624. 

 Q.— p. 199, Fig. I9f,f',f",f"'. p. 199, Fig. 20, C.N. 419b. 



Longitudinal Sections. 



L— p. 341, Fig. 54b, C.N. 629. Fig. 55b. Fig. 56b, C.N. 631. 

 BB.— p. 25, Fig. 50c, C.N. 624b. 



Type of Lepidodendron hitermediiivi. Will. 

 This very rare form, of which I have seen but two 

 examples, has some features which ally it with L. 

 fuliginosuiii and others in connection with L. selaginoides. 

 It closely resembles the latter type in the intermingling of 

 its innermost tracheae of the primary xylem strand with 



