DESCRIPTIONS OF SPECIES. 

 PTERIDOPHYTA. 



Order FILICALES. ' 



Family GLEICHENIACE^. 

 Gleichenia gracilis Heer? 



PI. I, fig. 9. 



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

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

 pi. 3, fig. 3. 



Tliis specimen is too imperfect for satisfactory comparison with anj^ descriptions 

 or figures, and it is too fragmentary to serve as the basis fqr 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. acutiloha Heer", 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 Holhck. 

 Specimen in Mus. New York Bot. Gard. 



Gleichenia protog^a Debey and Ettingshausen ? 



PI. I, fig. 8. 



Gleichenia protoyxa Deb. and Etts., Denkschr. Wien Akad. Wissensch., Ma^h.-Natunviss 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. '' 



Locality: G&j Head, Marthas Vineyard. Collected hj Arthur Hollick. Spec- 

 imen in Mus. New York Bot. Gard. 



Family CYATHEACEiE. 



Thyrsopteris grevillioides (Heer) n. comb. 



PI. I, figs. 10-13. 



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



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

 Grevillea tenera Velenovsky, Fl. Bohm. Kreideform., pt. 4, 1885,- p. 11 [72], pi. 7 [30], figs. 9, 14, 16. 



aNeueDcnksch. 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. 



bO. comptoniacfolia (Deb. and Etts.) Heer, Fl. Foss. Arct., vol. .S (Kreide-Fl. ), 1S74, p. 49, pi. 11, figs. 1, 2 (=Didi/mosorus 

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



G. delieatula Heer, ibid., p. 64, pi. 9, figs, lie, Uf ; pi. 10, figs. 16, 17. 



G. Nauckhoffi Heer, ibid., p. 90, pi. 25, fig. 4. 



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