Annual report of the United States Geological Survey to the Secretary of the Interior . from the large lateral pinna shown in fig. 1. Fig. 3/ Pinnule of the same specimen enlarged to show the nervation. Twice thenatural size. Lower Lykens division—Lower zone. Neuroptkkis Pocahontas I). \V. (Page 888.) Fig. 4: Specimen showing the characteristic form and development, of the pinnulesof this species. From the roof of the Pocahontas coal near CYozers, inthe Great Flat Top coal held, West Virginia. Fig. 4d. Pinnule of the same specimen enlarged to show the nervation. Twice thenatural size. Age of t
Annual report of the United States Geological Survey to the Secretary of the Interior . from the large lateral pinna shown in fig. 1. Fig. 3/ Pinnule of the same specimen enlarged to show the nervation. Twice thenatural size. Lower Lykens division—Lower zone. Neuroptkkis Pocahontas I). \V. (Page 888.) Fig. 4: Specimen showing the characteristic form and development, of the pinnulesof this species. From the roof of the Pocahontas coal near CYozers, inthe Great Flat Top coal held, West Virginia. Fig. 4d. Pinnule of the same specimen enlarged to show the nervation. Twice thenatural size. Age of the, Lower Lykens division. Xecropteris Pocahontas var. pentias D. W. (Page 892.) Fig. 5. Upper pinn;e and succeeding suhlohate pinnules. From the roof of Lykens coals 5 or 6 at the Brookside 5a. Sublobate pinnule, enlarged to show close, relatively parallel nervation. Three times the natural 5//. Fragment from the lamina of the same pinnule. Enlarged to illustrate the interneural striatum. 922 Lower Lykens division—Lower zone. OF THE UNIVERSITY
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