72 FLOKA OF LOWER (JOAL MEASURES OF MISSOURI. 



ALOIOPTERIS (COKYNEPTJiKIS*) WlNSLOVII n. Sp. 



PI. XXII, Figs. 1-3; PI. XXIII, Fig-s. 1-5. 



1843. Of. Pecopteris {DiiilazUes) cristatus Gutbier, in Xaumami, Cotta, Geinitz, et al.r 



Gila von Saclisen, p. 80. 

 1848. Of. Pecopteris cristata Gutb. (uon Brongn.), Goepjjert, in Bronn : Index Palteont., 



p. 915. 

 1879. Pecopteris cristata Gutb., Lesquereux, Goal Flora, Atlas, p. 8, pi. xliv, figs. 2, 2a; 



text, vol. i (1880), p. 256. 



1854. An Asplenites Sternberfjii Ettingshausen, Foss. Fl. Radnitz, pi. xx, figs. 2, 3, 4, 



p. 42 (pars) f 



1855. Cf. Alethopteris cristata (Gutb.) Geinitz, Verst. Steink, Sachsen, p. 29, pi. xxxii, 



fig. C. 

 1885. (Jf. Saccopteris {Alethopteris) cristata (Gutb.) Stur, Fame d. Carbon-FL, p. 164. 

 1897. Pecopteris sp., D. White, Bull. Geol. Soc. Amer., vol. viii, pp. 296, 300. 

 1899. AJoiopteris^ Winslovii D. White, i9th Ann. Rept. U. S. Geol. Surv., pt. 3, p. 487. 



The doubt expressed by Professor Lesquereux^ as to the equivalence 

 of the American form identified as Pecopteris cristata with the species figured 

 by Geinitz^ appears to me well founded. Our specimens differ from that 

 figured in the " Versteinerimgen " by the narrower divisions, the nerves 

 originating, as may be seen in the photograph (PL XXIII, Fig. 2) of a 

 slightly macerated and abraded specimen, at a much wider angle, straight 

 or nearly so instead of cm-ving, not forkiiig below the middle, and forking 

 once or twice at a very wide angle into short, straight divisions. It seems 

 evidently distinct from that species. 



In its general aspect and featiu'es our plant is very similar to the speci- 

 men described by Ettingshausen^ as Asplenites Sternhergii, but, although 

 some of the pinnae in our specimens are very much like those seen in 

 Zeiller's figure of the same species,* the detail in this figure, as well as in 

 Ettingshausen's illustrations, indicates a more slender form, with broader 

 midrib and blunter teeth. Some of Stur's photographic figures of Saccop- 

 teris Essinghii (Andra)' are, however, so like the ordinary specimens of our 

 plant, as seen in PI. XXII, Figs. 1 and 2, that it seems far from improb- 

 able that the specimens he had in hand should be included in the same 



' Coal Flora, p. 256. 



- Verst. Steink. Sachseus, p. 29, pi. xsii, figs. 6, 6a. 



' Steinkolenfl. Radnitz, 1855, p. 42, pi. xx, figs. 2, 3. 



■" Sjihenojyieris Sternbergii (Ett.) ZeiUer, Fl. foss. houill. Valemieiines, Atlas, pi. ix. figs. 5, 5a, p. 128. 



^ Fame d. Carbon-Flora, p\. lii, figs. 2-6, p. 166. 



