JURASSIC FLORA OF DOl'CILAS ('OFNTY. ORGK. 115 



C'tknis ()I!<)\ii.i.i:nsis Foiihiiiu'. 

 I'l. XXVII. Fi-s. 1 .-,; i'l. XXVlll, Fig. 1. 



ISOfi. Otenis nroriJI, ii.sis Foul.: .\iii. . urn. Sci., 4th sor., Vol. II, p. 274 (nonicn.). 

 1()()(). rfnil'< ororllhnsls Foul.: 'rwciilieth Ann. Kep. U. S. Geol. Surv., IS'JS <)!), 

 Pt. IF p. A'u. 1)1. Iviii. iifj;. 4. 

 This splciulid plaiil was found in tlic Orovillc flora. A considerable 

 number of specimens weiv obtained fi'om some of the ( )iv.<ion localities, 

 whicli make it possible to add something to the description of its character. 

 The Oregon specimens show the leaflets nioi-e completely-. The lea\es 

 must have been \'ery large, as is indicated by the fragment depleted in 

 Fig. 141, which is the largest found. This is a good deal distorted and 

 mutilated, so that it does not show the exact mode of attachment of 

 the leaflets, as they are toward tlieir bases most imperfect. The figure 

 represents the upper i)ait of a leaf, showing the upper leaflets w^ith 

 their l)ases very near the axis, but not attached to it. If their 

 attitude is not distorted they must, in this portion of the leaf, liave 

 gone off under an acute angle. One of the leaflets in a lower position 

 is nearly entire and will give an idea of the size. Though not entire, it 

 is still 17 cm. long, and near its base is 2 cm. wide. These dimensions 

 are found in what is probably an average leaf, and they indicate a 

 length of 20 cm. In this specimen all the leaflets are distorted in their 

 l)asal portions. The leaf substance appears to have been quite thin 

 in proportion to the size of the leaflets. The terminal part of the 

 leaflets was narrowed so as to give the entire leaflet a salver form. The 

 nerves are rather remote and are approximately parallel. They are 

 slender, but sharply defined, and immersed in the leaf substance. 

 The>' anastomose rather rarely and irregularly, ])y sending off a 

 branch which unites with an adjacent nerve at a very acute angle. 



PI. XXVn, Fig. I, gives the most complete specimen found. Fig. 

 2 shows one of the leaflets enlarged. Fig. 3 shows th(> base of a leafl(>t, 

 indicating its mode of attachment. This is slightly enlarged in Fig. 4. 

 Fig. 5 gives what seems to have been the upper part of a leaf. It lias 

 the basal parts of several leaflets attached to the midrib, but the attach- 

 ment is oliscured by distortion. PI. XXVIII, Fig. 1, shows the basal 

 parts of several leaflets, so placed as to indicate a former attachment to 



