274 Systematic Paleontology 



Black Hills area and from the Kootanie formation in both Montana and 

 British Columbia. There is some variation exhibited by the various 

 forms referred by the writer to this species, and some of the smaller 

 ultimate pinns are readily confused with other species of Onychiopsis. 

 The specimen figured is characteristic, and well shows the distinctness of 

 this type when represented by reasonably complete material. 



Occurrepxe. — Patuxent Formation. Fredericksburg, Dutch Gap, 

 Telegraph Station (Lorton), Virginia; New Eeservoir (?), District of 

 Columbia. Arundel Formation. Bewley Estate (?), Bay View (com- 

 mon), Maryland; Langdon, District of Columbia. Patapsco Forma- 

 tion. Deep Bottom, Mt. Vernon, Hell Hole ( ?), Chinkapin Hollow ( ?), 

 Virginia; Federal Hill (Baltimore), Maryland. 



Collections. — IT. S. National Museum, Johns Hopkins University, 

 Goucher College. 



Onychiopsis psilotoides (Stokes and Webb) Ward 

 Plate XXXV; Plate XXXVI, Figs. 7-9 



Hyvienopteris psilotoides Stokes and "Webb, 1824, Trans. Geol. Soc, Lon- 

 don, 2d ser., vol. i, p. 424, pi. xlvi, fig. 7; pi. xlvii, fig. 2. 



Hymenopteris psilotoides Sternberg, 1825, Fl. Vorwelt, Tentamen, p. xxil. 



Sphenopteris Mantelli Brongniart, 1827, in Mantell, Illus. of the Geol. of 

 Sussex [revised ed.], p. 55, pi. i, figs. 3a, b; pi. iii, figs. 6, 7; pi. iii*, 

 fig. 2. 



Sphenopteris Mantelli Brongniart, 1828, Prodrome, p. 50; Hist, veget. 

 foss., 1828, p. 170, pi. xlv, figs. 3-7. 



Sphenopteris Mantelli Mantell, 1833, Geol. S. E. England, p. 241. 



Sphenopteris Mantelli Sternberg, 1833, Fl. Vorwelt, vol. ii, pts. v, vi, p. 56. 



Cheilanthites Mantelli Goeppert, 1836, Syst. Fil. Foss., p. 231. 



Gheilanthites denticulatiis F. A. Roemer, 1839 [non (Brongn.) Gopp.], 

 Verst. d. Norddeutsch. Oolithen-Gebirges, Nachtrag, p. 9, pi. xvii. fig. 

 la. 



Confervites fissus Dunker, 1844, Program d. hoheren Gewerbschule in 

 Cassel, 1843-1844, p. 5. 



Sphenopteris Mantelli Unger, 1845, Syn. Plant. Foss., p. 59. 



Confervites fissus Dunker, 1846, Monogr. d. Norddeutsch. Wealdenbildung, 

 p. 1, pi. i, fig. 1. 



Sphenopteris Romeri Dunker, Ibid., p. 3, pi. i, figs. 3, 4, 4a, 5. 



Sphenopteris tenera Dunker, Ihid., p. 3, pi. viii, fig. 5. 



Sphenopteris Mantelli Dunker, 1846, Monogr. d. Norddeutsch. Wealdenbild- 

 ung, p. 2, pi. i, fig. 4a. 



Sphenopteris Mantelli Bronn, 1848, Index Pal., p. 1169. 



