FLORA OK THE SHASTA FORMATION. 



I OS 



ill all llic portions seen. They are ivniote, IxMiig 1 inin. apart. M( 

 of them teriiiiiiate in the posterior margin of the leaflet. Although this 

 may not he a Ptero{)hylluin. it is clearly a s])e('ies distinct from the other 

 plants found in the Shasta group, and <liffei-ent fi'oin any Pterophvlhnn 

 hitherto found in the Lower Cretaceous or Xeocomian formations. It 

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

 India. Among previously described plants of the Lo\v(m- Cretaceous, 

 it is most like Podozainite.s grand ij'oU us T'ont., of the Lower Potomac of 

 Virginia," which is itself a plant not positively detei'inined. The nerves, 

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

 \Trgiiiia 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 oljtained. 



Genus CTEXOPHYLLUM Scliiin])pr. 



Ctenophyllum LATUOLit'.M Fontaine? 



PL LXVII, Fit;. 10. 



L889. Ctenophi/lluDi Idtifolium Font.: Potomac Flora (Monogr. U. S. Geol. Snrv., 

 VoL XY), p. 17.5, pi. ixviii, figs. 2, 2a. 3. 



One specimen was fotmd at locality X'o. 17 that resembles Ctcno- 

 phyllion laiifolium of the Lower Potomac of \'iriginia. 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 Ije a large Pterophyllum of the type 

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

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

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

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

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

 like those shown in the Cahfornia fossil. 



'« Monogr. U. S. Geol. Surv., Vol. XV, p. ISO, pi. lx.\.\ii, tig. 2; pi. l.\.\.xiii, fig. .5. 



