g6 Dr. W. C. WilliAxMSON on ^ 



Sporangiophores. 

 Transverse Sections. 



S.—p. 258, Fig. 2f, C.N. 1049B. Fig. 5f, C.N. 1050. Fig. yf, C.N. 

 1049B. 

 p. 258, Fig. 8f, C.N. 1050. Fig. loff, C.N. 1051. 

 p. 259, Fig. 15, C.N. 1898H. 



Longitudinal. 



S.—p. 258-9, Fig. 4f, C.N. 1050. Fig. 5f, C.N. 1050. Fig. 7f, C.N. 

 1049B. Fig. 8f, C.N. 1050. Fig. i6f, C.N. 1049B. 



Sporangiophoral Trache.i;. 



S.—p. 258, Fig. 9f, C.N. 1049A. Fig. I4f, C.N. 1049B. 

 p. 259, Fig. 15, C.N. 1898C. 

 p. 260, Fig. i6f'r", C.N. 1049B. 



Sporangia. 



S.—p. 259-260, Figs. 2g, 4g, log. 

 p. 260, Fig. 16, C.N. 149B. 

 Spores. 



S. — p. 260, Figs. 17-18, C.N. 1053. 



In the index to the plates in Memoir XVIII., the references to the cabinet number of the 

 specimens figured should be, Fig. 6, C.N. 1049C , Fig. 7, C.N. 1049B ; Fig. 8, C.N. 1050 ; 

 and Fig. 10, C.N. 1051. 



LYCOPODIACEyE. 



Lepidodendron, Sternberg; Lepidophlozos, Sternberg; Loniato- 

 pldoios, Corda ; Sigillaria Brong. ; Sttginaria, Brong. ; 

 Syringodendron, Steriib. ; Diploxylon, Corda."^ 



In dealing with this extensive family, I have already 

 observed that some additions to the plan followed in Part I. 

 appear necessary. In my Memoirs I have adopted the 

 plan of giving provisional names to several of the types of 

 form that I have described, but it must be remembered that 

 in adopting this plan it is not my intention that these names 

 should be regarded as specific ones. They are only assigned 



* When my Memoir, Part II., was published (1872), I was struggling, 

 aided only by limited supplies of imperfect material, to grope my way 

 through the conflicting conclusions of preceding authors. This was especially 

 the case with the Anabathra of Witham and the Diploxylon of Corda. The 

 former is but a Lepidodendron. Even in that Memoir I determined that both 

 these genera " are unmistakeably Lepidodendroid in structure"' (loc. cit., p. 20S). 

 I have not referred to all the contents of that Memoir in this Inde.x, because 

 most of the objects described in it are described in much fuller detail in later 

 Memoirs. 



