230 MESOZOJC FJ.ORAS OF UNITED STATES. 



Family MATONIACE^. 

 Giimis MATONIDIUISI Schenk. 

 Matonidium Althausii (Dunker) Ward." 

 PI. LXV. Figs. 22, 2.S. 



1S44. Cijcadiies AJfliausii Dunk.: Programm d. hohcren Gewerbscluile in Cassel. 



1S43-1S44, p. 7. 

 1846. Pecopteris AltJunisii Dunk.: Monogr. d. Norddeutsch. Wealdenbildung, p. .5, 



pi. ii, fig. 2. 

 1846. Pfcopferis polydactyhi Gfijip. in Dunker: Op. cit., p. 5, pi. vii, fig. 4. 

 1846. Pecopteris Conyheari Dunk.: Op. cit., p. 7, jil. ix, figs. S, Sa. 

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

 1849. Pecopteris clegans (G' pp.) Brongn. [non (Gopp.) Germ nee Sternb.]:'' Tableau, 



p. 107. 

 1852. AletJiopteris Ga-ppcrti Ett.: Abh. d. k. k. Geol. Reichsanst., Vol. I, Abth. Ill, 



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

 186-5. Laccopteris PhUlipsii Zign.: Osserv. sulle Felci Foss. dell' Oolite, p. .37. 

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



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

 1871. Matonidium Gapperti (Ett.) Schenk: Palaeontographica, Vol. XIX, j). 220 



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

 1888. Matonidium polydaciylum (Gopp.) Schenk: Die fossilen Pflanzenreste, p. 39. 

 1891. Laccopteris pohjductyln (Gfipp.) Saj).: Plantes Jurassiques, Vol. IV, p. 3S4. 

 1894. Osmimda dicl-sojiioides 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 dicksonioides Font.? in Stanton: Bull. U. S. Geol. Surv., No. 



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

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



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



Among the fragmeiital fossils in the collections that are insufficient 

 for positive determination, two imprints, strikingly like Matonidium 

 Althausii, were found. Although they can not l)e determined positively 

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



" I repeat tlie .s\TionyinY of tliis speeies a.s given in my paper on the Black Hills (Nineteenth .\.nn. Rep. U. S. 

 Geol. Sur\-., Pt. II, p. 0.5:3 ), with a few clianges. Laccopteris PMllipsn Zign. wa,s there omitted by inadvertence, 

 and Pecopteris erplanatn Traittsch. should have been marked a.sdoubtfid, or omitted. The latter course is now 

 pursued. No explanation was then made as to why this combination nuist be adopted, as it was sufTiciently 

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

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



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



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



