JURASSIC FLORA OF DOIMILAS COlNrV. OHP:(i. 75 



that goes off obliquely and which has several lateral nerves that depart 

 under a small angle and seem to he single. The plant seems to l)e a 

 new species. It has some resemljlance to Sderopteris Pomelii, hut the 

 pinna' are shorter and the pinnules are shorter in {proportion to their 

 width. They are also more closely placed and more ol)tuse. It is more 

 like Heer's Dicksonia f/racilis," hut differs from that in the heteromor- 

 phous l)asal pinnule and in the shorter ultimate j)inna'. It is near 

 enough, however, to he regarded as perhaps a repi'esentative of the 

 Sil)erian fossil in the Oregon Jurassic. PI. XII, Fig. 1, shows the only 

 specimen found, Fig. 2 a pinna enlarged, and I'ig. 3 an enlarged normal 

 pinnule. 



Genus RUFFORDIA Seward. 



RuFFORDiA GfEPPEKTi (Duiiker) Seward.'' 



PI. XII. Ficrs. 4-S. 



1S44. CheUantliitcs Gappertl Dunk.: Norddeutscli. \Valderthon, Prograniin der 



hoheren Gewerbscliule in Cassel, 1843-1844, p. 6. 

 1846. Sphenoptei-is Gccppeiii Dunk.: Monoi);r. d. Norddeutscli. Wcaldenhildun,^, 



p. 4, pi. i, fig. 6; pi. ix, figs. 1-.3. 

 1S4G. Sphenoptrris Ilartleheni Dunk.: op. cit., p. 4, pi. ix, iig. 9. 

 1846. Sphenopfo'i.s long'ijoJiit Dunk. [:non PhiU. nee Feistni.]: o]). eit., p. 4, |)l. viii, 



fig. 6. 



1851. tiphenopteris adianiifrons Ett. : -Jahrli. d. k. k. Geol. Reich.sanst., Jalu'g. II, 



p. 1.57. 



1852. Sphenopteris JugJeri Ett.: Beitr. z. Fl. d. Weald enperiode, p. 15, pi. iv, fig. 5. 

 1870. Sphenopteris Auerhachl Trautsch.: Der Klin'sche .Sandstein, Nouv. Mem. 



Moscou, Vol. XIII, p. 207 [19], pi. xviii, fig. 5. 

 ISSl. Sphenopteris valdensis Heer [in part]: Fl. Fo.s.s. du Portugal, p. 14, ]>!. xv, 



fig. 11. 

 1889. Sphenopteris sp. Yok.: Joiirn. Coll. Sci. Ini]). I'niv. Japan, \o\. Ill, Pt. I, 



p. 34, pi. xiv, figs. 13, 13a. 

 1894. Ruffordia Ocepperti (Dunk.) Sew.: Wealden Flora, Pt. I, i)p. 7C), 77, pi. iv; 



pi. v; pi. X, figs. 1, 2. 



" Fl. Foss. Arct., Vol. IV, Pt. II, p. 92, pi. xvii, fig. 3. 



I' Mi-. Seward (Wealden Flora, Pt. I, p. 76) includes in his synonymy of this species the Sphenopkris Phil- 

 lipsii of Mantell, published in 1833, or eleven years earlier than Dunker's Cheilanthites Gapperti, but still pre- 

 fers Dunker's specific name on the ground that Mantell's specimen was a fragment "so .small that its real 

 nature must remain uncertain," but without saying whether he had seen it. As the use of Mantell's name 

 in the synonymy would change the combination, oui- only course is to omit it, as Fncniiies mruntiis L, it H. 

 was omitted from the synonymy of M archantites erecliis (Bean) Seward. — L. F. W. 



