Explanation of Plate 1 



Fig. 1 — Tasmanites ; segment cut away to show mode of perforation. Symmetry is unicentric 



with no axis more developed than another p. 11 



2 — Triletes; specimen of the sectio Aphanosonati; after Zerndt ; 2a, diagram showing un- 

 compressed form in the axial plane corresponding with a trilete ray p. 18 



3 — Triletes radiosus ; sectio undifferentiated; after Zerndt; 2a, diagram showing uncom- 

 pressed form in the axial plane corresponding with a trilete ray .... pp. 18, 24 



4 — Punctati-sporites; 4a, equatorial (transverse) plan; -^^^ axial (longitudinal) plan . p. 29 



5 — Laevigato-sporites ; 5a, equatorial (transverse) plan; 5h, longitudinal plan correspond- 

 ing with the longest axis p. 36 



6 — Alati-sporites; 6a, axial (longitudinal) plan; 6b, equatorial (transverse) plan . . p. 33 



7 — Reticulati-sporites ; in some instances the reticulation may cover proximal and distal 

 hemispheres about equally; 7a, equatorial (transverse) plan; 7h, axial (longitu- 

 dinal) plan p. 34 



8 — Granulati-sporites ; 8a, equatorial (transverse) plan; 5'^, axial (longitudinal) plan . p. 32 



9 — Denso-sporites ; segment cut away to show thickening of peripheral region of spore 

 coat; 9a, axial (longitudinal) plan uncompressed; 9h, form such spores habitually 

 assume under normal compression ; 9c, equatorial (transverse) plan p. 39 



10 — Cystosporites; proximal end of spore with three abortive tetrad members attached at the 

 apex; 10a, small drawing of complete fertile spore; 10b, apex of fertile spore show- 

 ing trilete apparatus when abortive members are disconnected p. 40 



[68 



