JURASSIC FLORA OF DOUGLAS COUNTY, OREG. 75 



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

 under a small angle and seem to be single. The plant seems to be a 

 new species. It has some resemblance to Scleropteris Pomelii, but the 

 pinnse are shorter and the pinnules are shorter in proportion to their 

 width. They are also more closely placed and more obtuse. It is more 

 like Heer's Dicksonia gracilis,''' but differs from that in the heteromor- 

 phous basal pinnule and in the shorter ultimate pinnse. It is near 

 enough, however, to be regarded as perhaps a representative of the 

 Siberian fossil in the Oregon Jurassic. PL XII, Fig. 1, shows the only 

 specimen found, Pig. 2 a pinna enlarged, and Fig. 3 an enlarged normal 

 pinnule. 



Genus RUFFORDIA Seward. 



RuFFOEDiA GcEPPERTi (Dunker) Seward.* 



PI. XII, Figs. 4-8. 



1844. CheilantMtes Gapperti Dunk.: Norddeutsch. Wiilderthon, Programm der 



hoheren Gewerbschule in Cassel, 184.3-1844, p. 6. 

 1846. Sphenoptens Gapperti Dunk.: Monogr. d. Norddeutsch. Wealdenbildung, 



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

 1846. SpJienopteris Hartlebeni Dunk.: op. cit., p. 4, pi. ix, fig. 9. 

 1846. Splienopteris longijolia Dunk. [:non Phill. nee Feistm.]: op. cit., p 4 pi viii 



fig. 6. 



1851. Sphenopteris adiantifrons Ett.: Jahrb. d. k. k. Geol. Reichsanst., Jahrg. II, 



p. 1.57. 



1852. Splienopteris Jugleri Ett.: Beitr. z. Fl. d. Wealdenperiode, p. 15, pi. iv, fig. 5. 

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



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

 1881. Splienopteris valdensis Heer [in part]: Fl. Foss. du Portugal, p. 14, pi xv 



fig. 11. 

 1889. Splienopteris sp. Yok.: Journ. Coll. Sci. Imp. Univ. Japan, Vol. Ill, Pt. I, 



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

 1894. Ruffordia Gmpperti (Dunk.) Sew.: Wealden Flora, Pt. I, pp. 76, 77, pi. iv; 



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



«F1. Foss. Arct., Vol. IV, Pt. II, p. 92, pi. xvii, fig. 3. 



i Mr. Seward (Wealden Flora, Pt. I, p. 76 ) includes in his synonymy of this species the Sphenopteiis Phil- 

 iipsii of Mantell, published in 1833, or eleven years earlier than Dunker's Cheilanthites Giepperii, 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, our only course is to omit it, as Fucoides arcuatus L. & H. 

 was omitted from the synonymy of Marchantiles erecius (Bean) Seward.— L. F. W. 



