230 MESOZOIC FLORAS OF UNITED STATES. 



Family MATONIACEyE. 

 Genus MATONIDIUM Schenk. 

 Matonidium Althausii (Dunker) Ward.'' 

 PI. LXV, Figs. 22, 23. 



1844. Cycadites Althausii Dunk.: Progranam d. hoheren Gewerbschule in Cassel, 



1843-1844, p. 7. 

 1846. Pecofteris Althausii Dunk.: Monogr. d. Norddeutsch. Wealdenbildung, p. 5, 



pi. ii, fig. 2. 

 1846. Pfcopteris polydactyla Gopp. in Dunker: Op. cit., p. 5, pi. vii, fig. 4. 

 1846. Pecofteris Conyheari Dunk.: Op. cit., p. 7, pi. ix, figs. 8, 8a. 

 1846. AlethopteHs elegans Gopp. in Dunker: Op. cit., p. 8, pi. vii, figs. 7, 7a. 

 1849. Pecofteris elegans (G"pp.) Brongn. [non (Gopp.) Germ nee Sternb.] :* Tableau, 



p. 107. 

 1852. Ahthoi)teris Gcepferti Ett.: Abh. d. k. k. Geol. Reichsanst., Vol. I, Abth. Ill, 



No. 2, p. 16, pi. V. 

 186.5. Laccopteris Phillipsii Zign. : Osserv. suUe Felci Foss. dell' Oolite, p. 37. 

 1869. Laccopteris Ompperti (Ett.) Schimp. [non Schenk'']: Pal. Veg., Vol. I, p. 582, 



Atlas, pi. xxxi, figs. 5-8. 

 1871. Matonidium Gmpperti (Ett.) Schenk: Palaeontographica, Vol. XIX, p. 220 



[18], pi. xxvu [vi], fig. 5; pi. xxviii [vii]; pi. xxx [ix], fig. 3. 

 1888. Matonidiwm. polydactylum (Gopp.) Schenk: Die fossilen Pflanzenreste, p. 39. 

 1891. Laccopteris polydactyla (Gopp.) Sap.: Plantes Jurassiques, Vol. IV, p. 384. 

 1894. Osmunda diclcsonioides Font.? in Diller & Stanton: Bull. Geol. Soc. Am., 



Vol. V, p. 450, quoad Cat. U. S. Nat. Mus., No. 4004. (PL LXV, Fig. 23.) 

 1895 [1896]. Osmunda diclcsonioides Font.? in Stanton: Bull. U. S. Geol. Surv., No. 



133, p. 15, quoad Cat. U. S. Nat. Mus., No. 4004. (PI. LXV, Fig. 23.) 

 1899. Matonidium Althausii (Dunk.) Ward: Nineteenth Ann. Rep. U. S. Geol. 



Surv., 1897-98, Pt. II, p. 653, pi. clx, figs. .5-8. 



Among the fragmental fossils in the collections that are insufficient 

 for positive determination, two imprints, strikingly like Matonidmm 

 Althausii, were found. Although they can not be determined positively 

 as that plant, they are certainly different from the other ferns found. 



« I repeat the sj'nonymy of this species as given in my paper on the Black Hills (Nineteenth Ann. Rep. U.S. 

 Geol. Suit., Pt. II, p. 653), with a few changes. Laccopteris Phillipsii Zign. was there omitted by inadvertence, 

 and Pecopieris explanata Trautsch. should have been marked as doubtful, or omitted . The latter course is now 

 pursued. No explanation was then made as to why this combination must be adopted, as it was sufficient!}' 

 clear from the synonymy, since the Oycadiies Althausii Dunk, was described in 1844 and figured as Pecopteris 

 Althausii Dunk, in 1846, and no one questions its being this species. — L. F. W. 



i Two Carboniferous species have been given this name. — L. F. W. 



'Schenk (Foss. Fl. d. Grenzsch., 1867, p. 94) gave this name to a Rhetic species. 



