DESCRIPTIONS OF SPECIES. 

 PTERIDOPHYTA. 



Order FILICALES. 



Family GLEICHENIACEiE. 



Gleichenia gracilis Heer? 



PI. I, fig. 9. 



Gleichenia gracilis Heer, Fl. Foss. Arct., vol. 3 (Kreidc-Fl.), 1874, p. 52, pi. 10, figs. 1-5, 6a-ll; pi. 26, figs. 

 13b, 13c, 13d; " Gleichenia gracilis Heer (?)," llollick, Annals New York Acad. Sci., vol. 11, 1898, p. 57, 

 pi. 3, fig. 3. 



This specimen is too imperfect for satisfactory comparison with any descriptions 

 or figures, and it is too fragmentary to serve as the basis for a description of a new 

 species. It is possible that it may represent a larger, lower portion of a frond of 

 Gleichenia gracilis than is depicted in any of Heer's figures of that species (loc. cit.) ; 

 and it may also be compared with G. acutiloba Heer a , from which species also it 

 seems to differ mostly in the smaller size of its pinnules. 



Locality: Black Rock Point, Block Island. Collected by Arthur Hollick. 

 Specimen in Mus. New York Bot. Gard. 



Gleichenia protog-Zea Debey and Ettingshausen ? 



PI. I, fig. 8. 



Gleichenia protogsea Deb. and Etts., Denkschr. Wicn Akad. Wissensch., Ma.h.-Naturwiss CI., vol. 17 (Urwelt. 

 Acrobryen Kreidegebirg. Aachen und Maestricht), 1859, p. 191, pi. 1, figs. 11, 12, g, h. 



This fragment, although too small for satisfactory identification or comparison, 

 is certainly referable either to this or to one of the closely allied species of Gleichenia 

 from the Cretaceous of Greenland, Switzerland, and Europe. 6 



Locality: Gay Head, Marthas Vineyard. Collected by Arthur Hollick. Spec- 

 imen in Mus. New York Bot. Gard. 



Family CYATHEACEyE. 



Thyrsopteris grevillioides (Heer) n. comb. 



PI. I, figs. 10-13. 



Sphenopteris grevillioides Heer, Fl. Foss. Arct,, vol. 3 (Kreidr-FL), 1874, p. 34, pi. 11, figs. 10, 11; White, Am. 



Jour. Sci., vol. 39, 1890, p. 97, pi. 2, fig. 1; Hollick, Bull. G30I. Soc. Am., vol. 7, 1895, p. 13. 

 Grevillea tenera Velenovsky, Fl. Bohm. Kreideform., pt. 4, 1885, p. 11 [72], pi. 7 [39], figs. 9, 14, 16. 



aNeue Denksch. Schw. Gesellsch., vol. 24 (Fl. Quedlinburg) , 1872, p. 5, pi. 1, figs. 2, 2b; Fl. Foss. Arct., vol. 3 (Kreide-Fl.), 

 p. 97, pi. 26, figs. 14, 14b. 



bG. comptonizfolia (Deb. and Etts.) Heer, Fl. Foss. Arct., vol. 3 (Kreide-Fl.), 1874, p. 49, pi. 11, figs. 1, 2 (=Didymosorus 

 comptoniifolius Deb. and Etts., Denkschr. Wien Akad., etc., vol. 17, 1859, p. 186, pi. 1, figs. 1-5). 



G. delicatula Heer, ibid., p. 54, pi. 9, figs, lie, llf ; pi. 10, figs. 16, 17. 



G. Nauckhofii Heer, ibifl., p. 90, pi. 25, fig. 4. 



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