202 Sellards — Fronds of Crossotheca and Myriotheca, 



EXPLANATION OF PLATE VII. 



Figure 1. — Crossotheca sagittata ; part of a fertile frond. The lower and 

 the upper pinnules on the right hand side show the expanded 

 base. The second pinnule from the base on the same side gives 

 the full length of the sporangia, x 1/^. 



Figure 2. — Same species ; a pinnule with the matrix removed to show the 

 full length of the sporangia, x 2. 



Figures. — Same species; a medium sized pinnule seen from the base and 



side. 



x2. 



Figure 3of. — A single sporangium. x4. 



Figure 36. — Spores of the same species, x 240. 



Figure 3c. — Cross section of a fertile pinnule with sporangia, x 2. 



Figure 4. — Crossotheca trisccta sp. n.; fertile and sterile parts of frond, x ]4. 



Figures 4a, 46. — Fertile pinnules of C. trisecta. 



Figure 4c. — Spore of C. trisecta. x 240. 



Figure 5. — Myriotheca scaberrima ; fertile pinnules, x 2. 



Figures 5a-5c. — Spores of the same species, x 240. 



Figures 5cZ, 5e. — Starch grains from the spores of the same species, x 240. 



Figures 6a-6d. — Spores of Pecopteris villosa. x 240. 



Figure 7. — Pecopteris unita ; fertile pinna, x 2. 



Figures la-Id. — Spores of the same species, x 240. 



Figures. — Crossotheca sagittata; fertile and sterile parts in connection. 



Figure 9. — Crossotheca trisecta ; sterile pinnule. x 2. [ x 13^. 



