252 MESOZOIC FLORAS OF UNITED STATES. 



single, and close, being two to a millimeter. They stand at right angles 

 to the midrib. As usual in Nilsonia, the bases of the segments pass over 

 the margin of the midrib and meet in a raised line. This lies in the 

 middle of the midrib and is straight. 



This is a pretty distinctly characterized Nilsonia, although the 

 amount of material is small and the imprints are imperfect. It is not 

 ver)'- near anj- hitherto described plant unless it be N. comtula Heer " from 

 the Brown Jura of Ajikit and Bulun in SilDeria. It is, however, more 

 uniform in the character of its segments than this plant, and the nerves 

 are not so close. 



PL LXVII, Fig. 5, represents a portion of a leaf with several segments 

 more or less complete, which indicate the slight inequality sometimes 

 existing in them. Fig. 6 gives another small fragment which shows the 

 greater portion of a segment with its base and insertion very well pre- 

 served. Only the extreme tip of the segment is wanting, and it shows 

 well the character of the average segments. On this segment is shoAvn 

 a feature not uncommon in the segments of the leaves found here. This 

 is a slight narrowing of the segment just above the base. It is due to 

 distortion from pressure. 



Six specimens of the plant were found. It occurs at locality No. 9, 

 only in small fragments of leaves, which have several segments. 



Nilsonia calitornica Fontaine. 

 PL LXVII, Fig. 7. 



1894. Pterophylluin californicum Font, in DiUer & Stanton: Bull. Geol. Soc. Am., 

 Vol. V, p. 450 (nomen).* 



" Flor. Foss. Arct., Vol. V, Pt. II (Beitriige zur Foss. FI. Sibiriens und d. Amurkndes), pp. 19-20, pi. iv 

 figs. 10-16. 



''The list of species given in this paper contains the names without descriptions of all the plants that had 

 been collected in the Shasta group at that time, which as I have stated (pp. 140-141) were sent to Professor 

 Fontaine and determined by him. In his report which was sent to me on the 23d of February, 1894, and imme- 

 diately placed in Mr. Diller's hands, this new species was fully described as follows: 



" Pter-ophyllum califor-nicum n. sp., one specimen. This is a new species of that type of Pterophyllum which 

 is very characteristic of the Lower Cretaceous, and is illustrated by P. Brongniarti Morris, of the Wealden of 

 northern Germany, and by P. concinnum Heer, of the Kome beds of Greenland. The single specimen, although 

 but a small fragment of a leaf, shows several leaflets, with all their character distinctly displayed. It maybe 

 described as follows: Ptero-phyllutn californicum. Leaf unknown: leaflets attached by a widened base to the 

 side of the midrib, going off at a large angle, appro.ximating a right angle, falcately curved, varying irregularly 

 in width. The average leaflet is 3 mm. in width and 15 mm. in length. The ends of the leaflets are very obtuse 



