60 MESOZOK^ FLOKAS OF UNITED STATES. 



IflOO. Coniopieris hymenophylloule.i (Brongn.) St'\\. : .lur. I-'l. '^'orksli. Coast, p. 98, 

 pi. xvi, figs. 4 fi: 1)1. xvii. (igs. 3, 6-S; pi. xx. ligs. 1. 2: ])\. xxi. figs. 1-3, 

 3a. 4. 4a. 



.\ small Sphoiioploris-liko f(Mn, with fructification, was found at 

 locality Xo. 19. In the shap(> of it.s pinnules it much resembles .some 

 of the sphenopterid forms from t he Lower Oolite of Yorkshire. Seward," 

 in his paper on the plants of the Manchester Museum, pives good rea- 

 sons foi' adopting; the name Conioptei'is for some of the sphenopterid 

 forms of the Yorkshire Lower Oolite, ;uid unites a numl)er of them 

 with his species Conioptrris hyvwnojyhylloidcs. In his recent work on 

 the Yorkshire Fossil Plants he gives a number of figures of this species. 

 Some of these agree so well with the Oregon fossil now in question that 

 I have no doubt that ii is the same species with the English one. As, 

 however, the amount of niaterial is so small. I do not positively identify 

 it as such. 



The Oregon fossil occiu's in only one specimen in counterparts. 

 This shows a small fragment of a penultimate pinna, having several 

 ultimate ones that are neai'ly entire. The ])lant is l)eautifully pre- 

 served. The leaf substance is very thick and it appears wrinkled by 

 the strong nerves and the sori. The ultimate pinnae are very short, 

 the longest being hardly 15 nun. long, while their entire expanse at 

 ba.se, the widest part, is only about 7 mm. The pinnules are minute, 

 the largest basal ones being not more than about 4 mm. long and a 

 little over 'A nun. wide. They vary a good deal in shape as well as in 

 size, according to their position on the ultimate pinna. The rachis 

 has a narrow wing from which the pinnules rise. On the upper side 

 of the rachis the piniuiles are larger than on the lower side. The basal 

 pinnule on the upper side is larger than the others on that side. This 

 larger pinnule is subquadrate in form. The others on the same rachis 

 become more rounded, elliptic^al, and even club-shajxMl toward the 

 ends of the pinna*. The pinnules on the lower side aic all ellij)tical, 

 passing to rounded and club-shaped forms. The sulxjuadrate, and 

 indeed all the pinnules, are attached by much narrowed bases. The 

 lateral nerves in the larger pinnules are pinnately, but very obliquely, 

 placed on the midrib. In the others there is a parent nerve. 



o Notes on some Jura.ssic plants in the Manchester Museum: Manchester Memoirs, Vol. XLIV, No. 8, 

 1900, pp. 5-8. 



