FLORA OF THE SHASTA FORMATION. 255 



in all the portions seen. They are remote, being 1 mm. apart. Most 

 of them terminate in the posterior margin of the' leaflet. Although this 

 may not be a Pterophyllum, it is clearly a species distinct from the other 

 plants found in the Shasta group, and different from any Pterophyllum 

 hitherto found in the Lower Cretaceous or Neocomian formations. It 

 reminds one strongly of the great Pterophylla of the Rajmahal group of 

 India. Among previously described plants of the Lower Cretaceous, 

 it is most like Podozamites grandij'olius Font., of the Lower Potomac of 

 Virginia," which is itself a plant not positively determined. The nerves, 

 however, of the Shasta fossil are much more slender than those of the 

 Virginia plant and do not run so far parallel to the margin of the leaflet. 

 In this plant they run, with the exception of those near the anterior 

 margin, straight to the posterior margin, and terminate in it. It is to 

 be regretted that more of this fine plant was not obtained. 



Genus CTENOPHYLLUM Schimper. 



Ctenophyllum latifolium Fontaine? 



PL LXVII, Fig. 10. 



1889. Ctenophyllum latifolium Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 175, pi. Ixviii, figs. 2, 2a, 3. 



One specimen was found at locahty No. 17 that resembles Cteno- 

 phyllum latifolium. of the Lower Potomac of Viriginia. The specimen 

 consists of fragments of three leaflets, with their bases and terminal 

 portions not shown. The largest portion preserved of one of these has 

 a length of 11 cm., but it was originally much longer. Judging from 

 the parts preserved the leaflets were 27 mm. wide. They are strap 

 shaped. The nerves are parallel and unbranched. They are strong 

 and rather more than 1 mm. apart. As the attachment of these leaflets 

 was not seen the plant may really be a large Pterophyllum of the type 

 of those characteristic of the Rajmahal group of India. However, as 

 the specimen now stands it strongly reminds one of the fine plant C. 

 latifolium. Font., of the Lower Potomac of Virginia. If several leaflets 

 of that plant had been preserved in their middle parts only and placed 

 in a parallel position they would have left imprints on the stone just 

 like those shown in the California fossil. 



a Monogr. U. S. Geol. Surv., Vol. XV, p. ISO, pi. Ixxxii, fig. 2; pi. Ixxxiii, fig. 5. 



