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MR R. C. DAVIE ON 



base stages like the leaf-traces of Dineuron and Metaclepsydropsis have been found. 

 Etapteris diupsilon, Williamson, has the ends of the arms very much developed, 



Text-Fig. 7. — Diagrams illustrating the departure of the leaf-trace in Thamnoptcris SehleeMendalii, 

 Eiohw., sp. (After Gwynne-Vauuhan and Kidstok.) 



though the pinna-trace conns from the middle of the arm (of. text-fig. 8, />), just 

 from the position from which the pinna-trace goes off in Dineuron. Unfortunately 



