FLORA OF THE SHASTA FORMATION. 271 



to the base of the Chico. Very few plants come from them. The plants 

 described in this paper, or rather the different specimens, ascribed to 

 various genera and species, have very different values for throwing light 

 on the character of the flora. Some of the specimens can be positively 

 determined, others are of very doubtful character, and their assignment 

 to this or that species or genus means simply that the specimen is more 

 like the form with which it is identified than any other. I will try to 

 indicate in the lists the degree of positiveness with which the determina- 

 tion of a given plant, assigned to this or that horizon, has been made." 



Plants occurring in the Shasta or Lower Cretaceous beds. 



I. In the Knoxville or lower member only : 



1. Dicksonia pachyphylla Font. n. sp. Only one doubtful specimen. 



2. Thyrsopteris rarinervis Font. ? Few and very doubtful fragments. 



3. Cladophlebis parva Font. Imperfect specimens. 



4. Cladophlebis falcata Font. Numerous, and some fine specimens. 



5. Cladophlebis Ungeri (Dunk.) Ward n. comb. Two very small fragments. 



6. Gleichenia Nordenskioldi Heer ? Doubtful specimens. 



7. Sagenopteris ManteUi (Dunk.) Schenk. Good specimens. 



8. Hausmannia? californica Font. n. sp. Only one very doubtful specimen. 



9. Cladophlebis alata Font.? Doubtful specimens. 



10. Equisetum texense Font. ? Very doubtful specimen. 



11. Nilsonia Stantoni Font. n. sp. Fairly good specimen. 



12. NUsonia californica Font. A single but very good specimen. 



13. Nilsonia? sambucensis Ward n. sp. A few doubtful fragments. 



14. Pterophyllum ? lowryanum Ward n. sp. One very doubtful specimen. 



15. Zamites arcticus Gopp. Only one, but a distinct specimen. 



16. Cycadeospernuni calif ornicum Font. n. sp. A single but very distmct 

 specimen. 



17. Cephalotaxopsis?rhytidodes Wardn. sp. Several specimens. 



18. Abietites? sp. Font, immature cone. A single specimen of doubtful char- 

 acter. 



19. Protesephyllum californicum Font. n. sp. A single and doubtful specimen. 



20. Acaciasphyllum pachyphyllum Font. n. sp. A single but distinct specimen. 



a The following four species are not included in Professor Fontaine's discussion, having, except in one 

 . case, been sent to him since his report was received: 



1. Gleichenia Gilbert-Thompsoni Font. n. sp. (see p. 232). It comes apparently from the extreme upper 

 Horsetown beds; perhaps from the base of the Chico. 



2. Dioonites Buchianus rariiierms Font. ? This was included in his first report, from which the description 

 is taken, and the name published by Diller and Stanton. It is a small piece of a leaf on the same stone with 

 the immature cone of Abietites, and was overlooked in the final report. It comes from the Knoxville beds. 



3. Populus'i Bicei Font. n. sp. This certainly comes from the Horsetown beds. 



4. Sapindopsis oregonensu Font. n. sp. This is also from the Horsetown beds.— L. F. M . 



