9 
206 
EXPLANATION OF PLATE XVII. 
Fig. 28 .—Thinnfeldia McCoyi, sp. nov. 
Fig. 29 .—Thinnfeldia sp. 
Figs. 30, 30A, 31, 32, 33, and 34.— Rhizomopteris Etheridgei . sp. nov. Fig 
32 enlarged twice natural size. 
Fig- 35 -—Ginkgo sp. 
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