.j: ^'! 



iirui-j vf! 



-: Unoian . iHorj A .(: 



v!:--.M -. : , . . , -iv .  'i.v ' ... 



(.a X) .fc 



•'•■'■^^■^^J'^kiVi'.il^liconWuea'.'-" 



Fenestella (Polypoka) gkanilinea. 



rage lai. 

 Fi(f. 20. The non-cellulifei-ous tfube of a frond, natui-al size. 



Figii" 31v/A partioii of the preceding, fi'oiii near the base, showing- branches wi<ler than the fenestrates, and 

 ..I i,ri ■-Ui •■ 'Over the greater portion of the tigui-e from two lo thi-ee ranges of nodes. (X iJ.) 

 Fig. 23. An enlargement of a portion of the same frond at a distance from the base, showing the bi'anches 

 i -.niii-i-H) •frielightly wider than the fenestrules, but more angular than those of the preceding figure, and 

 having but one range of nodes, forming a nodulose carina along the middle of the bi-anch. 

 .i-Ui-ti\i'f\->-''{X, 6.) ■■;. i.j, - '. .* I ■■^.l 



Tig. 23. An enlargement from the celluliferooe face of a frond, showing the comparatiTe size of the 

 -idl^i sdi ij bi'anches and dissepimente, the caiinate (lissepiments, and the foiin and arrangement of the 

 cell apertures. (X 6.) 



Upper Helderberg gix)up. Ontario, Cancula. 



lion sdT .1 

 ■I'il^ruut-i bna oxm 9vii«-is<! I .61 .ftl ,' 



)!i lo 



III -iiiiyififn Ii'»'*i/'i>» -111; '<! , 



( 



list ad) lo Bnrgtnai oil) -» 



) tA) V «iii^ 



