PALEOZOIC co]st;-genus LEPIDOSTEOBUS. 235 



Fig. 11. Transverse section of cone axis. Sedgwick Mus. Coll., Slide 278. ( x47 circa.) 



(;>.=pitli j m.i'. = metaxy lem ; ^^.=protoxylem; /./. = sporopliyll trace; i.c. = inner cortex; 

 o.c. = outer cortex ; ^.jo.J.=base of sporophyll pedicel.) 



Fig. 12. Central part of tlie axis shown in fig. 11, enlarged. Sedgwick Mus. ColL^ Slide 278. (xl40 



circa.) 



{p. — pith; mx. — metasylem ; px. = protoxylem ; It. = sporophyll trace; i.e. = inner 



cortex.) 



4 



Lepidostrobus oldhamius, Will.^ f. minor. Figs. 13^ 14. 



Fig. 13. General view of a section, which is radial as regards most of the sporophylls^ but tangential 



as regards the axis. Binney ColL^ AM. 27. (x4^ circa.) 



(/. = sporophyll; /.je?. = pedicel of sporophyll ; .^/?.=spores ; /.^.=: sporophyll trace.) 

 Fig. 14. Apical portion of another section of the same cone as that seen in fig. 13^ showing a number 



of sporophylls and sporangia in tangential section. Binney Coll., AM. 26. ( X 4^ circa.) 

 (/. = sporophyll ; /.J9. = sporophyll pedicel ; 5pm. = spoi*augium.) 



Plate 24. 



Lepidostrobus oldhamiuSj Will. Figs. 15-17. 



Fig. 15. General view of part of the cone photographed in PI. 21. fig. 1. Sedgwick Mus. ColL^ Slide 



281. (x 14.) The sporangium which is marked* is that indicated by an asterisk in PL 21. 



fig. 1. 



(;, = sporophyll; /,/. = vascular bundle of sporophyll; joar, = parichnos space; Ig.^M^nle ; 

 spm.w. = sporangium wall ; sp. = spores ; s.a.p, = sub-archesporial pad ; st.p. = plate of 

 sterile tissue arising from the floor of the sporangium.) 

 Fig. 16. Enlarged drawing of the sterile plate from the sporangium marked f in PL 21. fig. 1. Sedgwick 



Mm. ColL, Slide 281. (x 77 circa.) 

 Fig. 17. Sporophyll pedicel and base of sporangium in tangential section to show the sterile plate (5/.j:>.) 



in a sporangium older than that shown in fig. 16. U. C. L. ColL^ C. 19. (X 23.) 

 (5.a.j9.=:sub-archesporial pad; 5p/n.w;. = sporangium wall; /.p. = sporophyll pedicel.) 



Lepidostrobus Binneyanus, sp. nov. Figs. 18-25. 



Fig. 18. Metaxylem tracheides from the radial section of the cone axis photographed in PL 22. fig. 5, to 



show the vertical striations connecting the scalariform thickenings. Binney ColLj^ Q. a. 6. 

 (x318.) 

 Fig. 19. Sculpturing of a spiral protoxylem tracheid seen in longitudinal section^ from the same pre- 

 paration as fig. 18. Binney ColL, Q. a. 6. (x 318.) 



Fig. 20. Radial longitudinal section^ not quite median, passing through the distal end of a sporophyll 



pedicel and showing the distal attachment of the sporangium. Binney ColL, Q.^, 4. (x 47.) 

 (/, = sporophyll lamina ; /.A. = heel of sporophyll lamina ; l.p, = sporophyll pedicel ; 



i.i, = transfusion tracheides ; spm.w. = sporangium wall; sp, = spores ; /y. = ? ligule ; 



pd. = periderm.) 

 ■Fig* 21. Radial longitudinal section through the proximal end of a sporophyll pedicel, showing the 



proximal attachment of the sporangium and the oblique downwardly directed course of the 



sporophyll trace in the axis. Binney CoIL^ Q. a. 6. (x 47.) 



(g^. = cone axis; /./. = vascular bundle destined for sporophyll; ^. = spocophyll pedicel; 



*^7«.tt7,:= sporangium wall; 5/.r. = ridge of sterile tissue rising into base of sporangium; 



^j^.^spores.'i 



