JURASSIC FLORA DOUGLAS COUNTY, OREG. 117 



enlarged. Figs. 7 and 8 show a fragment 4 cm. wide, indicating the 

 nerves quite well. 



The plant is not abundant. It is most common at locaUtj^ No. 7. 

 It occurs more rarely at localities Nos. 2, 9, and 18. 



Ctenis auriculata Fontaine? 



PL XXIX, Fig. 1. 



1896. Ctenis auriculata Font.: Am. Journ. Sci., 4tli ser., Vol. II, p. 274 (nomen.). 

 1900. Ctenis auriculata Font.: Twentieth Ann. Rep. U. S. Geol. Surv., 1898-99, 

 Pt. II, p. 356, pi. Iviii, figs. 1-.3. 



At locahty No. 7 a single specimen of a large Ctenis was obtained 

 that agrees quite well with C. auriculata, a plant first found in the 

 Oroville flora. The preservation is not perfect enough to make the 

 identification positive. A portion of the midrib was obtained having on 

 one side the basal parts of two leaflets, one pretty well preserved. This 

 is 5 cm. long and 3 cm. wide at base. It is attached apparently by 

 all of an unnarrowed base, which is not auriculate. The leaf substance 

 was very thin and left very little coal on the rock. The nerves are 

 strong, very remote, single at their bases, but anastomose freely about 

 15 mm. above their bases — more freely than in the Oroville specimens. 

 It may be a hew species." 



Genus ENCEPHALARTOPSIS Fontaine. 

 Encephalartopsis ? OREGONENSis Fontaine n. sp. 

 PI. XXIX, Figs. 2, 3. 



A single fragment of a leaflet, with resemblance to those of 

 Encephalartos, was found at locality No. 4. It is of doubtful affinity 

 and is mentioned because it certainly differs from the other cycads of 

 the Oregon flora. It is narrowly linear, narrowing gradually toward 

 its end. It has a thick, dense texture, which gives it a very rigid aspect. 

 Apparently it had a firm, almost horny epidermis. It must have had 

 a considerable length, for the part preserved, though a small portion 

 of the original leaf, still shows a length of 6 cm., with a maximum width 

 of 4 mm. It had spiny points going off at long intervals and turning 



c The specimen was on two pieces of rock, one the counterpart of one-lialf of the leaf shown on the other. 

 In the latter the leaf was foldedon both sides of a thin slab, the rachis running along the thin edge. The 

 ligure (PI. XXIX, Fig. 1 ) shows the frond unfolded and gives a fair idea of its nature. — L. F. W. 



