FLORA OF THE SHASTA FORMATION. 227 



of the plant pretty well, and there is little doubt that it is the widely 

 diffused Cladophlebis Browniana of the Lower Cretaceous. Some of the 

 pinnules, as those depicted in Fig. 10, show traces of sori too obscure 

 for their character to be made out with certainty. Yokoyama" had 

 already noticed sori like those of Aspidium on pinnules of this fern. 

 The sori of the Shasta fossil also appear similar to those of Aspidium. 



I have selected three specimens to be figured, out of the many 

 yielded by this plant. PL LXV, Fig. 10 represents a fragment of an 

 ultimate pinna, with pinnules of the largest size seen. This shows traces 

 of sori. Fig. 11 represents the terminal portion of an ultimate pinna 

 with normal pinnules. Fig. 9 represents the specimen originally referred 

 with doubt to Cladophlebis indinata. 



The plant occurs most abundantly at localities Nos. 1, 17, 19, 20, 21, 

 22, and 23. 



Cladophlebis falcata Fontaine. 



PI. LXV, Figs. 12-14. 



1889. Cladophlehis falcata Font.: Potomac Flora (Monogr. U. S. Geol. Surv., Vol. 



XV), p. 72, pi. iv, figs. 8, 8a; pi. v, figs. 1, la, 2, 3, 4, 4a, 5, 5a, 6, 6a, 7, 7a; 



pi. vii, figs. 1, la, 2, 2a. 

 1894. Thinnfeldia variabilis Font, [non Vel.]? in Diller & Stanton: Bull. Geol. Soc. 



Am., Vol. V, p. 450. (PL LXV, Fig. 14.) 

 1895 [1896]. Thinnfeldia variaUlis Font, [non Vel.]? in Stanton: Bull. U. S. Geol. 



Surv., No. 1.33, p. 15. (PL LXV, Fig. 14.) 



A number of specimens of a large Cladophlebis were found, which 

 can not be distinguished from C. falcata Font, of the Lower Potomac 

 beds of Virginia. Pinnules of both large and small size, such as were 

 seen in the Virginia specimens, were obtained. The large pinnules 

 seem to come from lower down on the frond and the smaller from 

 higher up on it. From the number of specimens found at some of the 

 localities yielding the plant, it must have been common at those places. 

 It does not, however, seem to have been abundant at many places, 

 for most of the localities show but few specimens. The specimens are 

 all in the form of fragments of ultimate pinnae, which show only a few 

 pinnules, or of single detached fragments of pinnules. The parts shown, 

 however, are well preserved, for the plant seems to have had a thick 

 leathery texture. 



"Jour. Coll. Soi., Imp. Univ. -Japan, Vol. VII, Pt. Ill, p. 21S, pi. xxiv, figs. 2, 3; pi. xxvii, figs. 1-4, .5c, .5d. 



