.HHASSIC FLOliA OF lM)r(iLAS COIWTV. OKKC. 79 



In tho (lose rip lion of this spoeies cjivrii in llu^ Twentieth Annual lleport 

 of tlie United States Ge()loo;ifal Survey, Pt. II (p. ;US), tho stat(Mnent, 

 by mis])rint, is made that "the fronds vai'\- in length from 1-4 cm." 

 Foi' "length" read width. The fragmenls .seen indicate that .some of 

 the Oregon leaves may ha\e reached the widtli of o cm. 



PI. XII. Fig. 12, shows the upp(>r part of one of the larger leaA'os, 

 and Fig. I'A a portion of this enlarged. Fig. 14 represents the basal 

 portion of ont^ of the nai'rower leaves that was evidently (juite long. 

 It is distorted by pi'essiu'e. Fig. lo gives the middle poi-tion of on(> 

 of the leaves of nuMlinm size. This, too, is distorted. Fig. Ki sliows 

 a leaf nearly entire, and Fig. 17 a portion of this enlarged. 



The plant is most common at locality No. 2, wdiere it is (juite abun- 

 dant. It is also found at localities Xos. 1, 7, 14, and 19. 



T^MOPTEKLS MAJOR Filldlov illld Huttoii. 



PI. XIIl. Ki.^.s. l-;5. 



1833. Tctnlopteris major L. & H.: Foss. Fl. Gt. Brit., Vol. II, p. 31, pi. xcii. 



1836. Asjndites WJUiamsonifi Gopp.: Syst. Fil. Foss., p. 353. 



1843. Fterozamites major (L. & II.) Fr. Br. in Miinstor: Boitr. z. Petrefacten-Kunde, 



Vol. II, Heft VI, p. 29. 

 1865. Txniopteris WiUiatrisonis (Gopp.) Zign. : Osserv. sullo Felci Foss. dell' Oolite, 



p. 39. 

 1869. Macrotxniopterifi major (L. & II.) Schiinp.: Pal. V('<;;., Vol. I, p. 610. 



Lindley and Ilutton have described wdth the name Tceniopteris 

 major " a fern that agrees so well with one foimrl in the Oregon Jm-assic 

 that there can be no doubt that it is the same. The dimensions of 

 the leaf and the size of the midrib in the two are the same, but there 

 is some difference in the latei'al nerves. In the figure given l)y Lindley 

 and Hutton of the English plant these nerves are represented as verv 

 slender, and not varying in thickness from their insertions to their 

 ends. They are also given as forking very copiously, especially at 

 the margin of the leaves. In the Oregon fossil the lateral nerves are 

 decidedly stronger near their bases, where they are attached to the 

 midrib, than they are near the margin of the leaf. Owing to the great 

 thickness of the leaf substance, and the fact that the plant is generally 

 slickensided, it is difficult to see them distinctly. This is especially 

 true of the parts near the margin of the leaves, for they have suffered 



« Foss. Fl. Ot. Brit., Vol. II, pp. 31-32, pi. xcii. 



