2b'2 JIKSOZOIC FLORAS OF [^M'PKD STATFS. 



single, and close, l)eing two to a millinietei'. They stand at riglit angles 

 to the ntidiil). As usual in Xilsonia, the buses 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 Xilsonia, althougli the 

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

 very near any hitherto described plant unless it be N. comtula Heer " from 

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

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

 are not so close. 



PI. 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 })ase and insertion ^'ery well jjre- 

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

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

 a featiu'e not uncommon in the segments of the leaves found here. This 

 is a slight narrowing of the segment just ai)ove 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. 



NlLSONlA CALIFORNICA FoutailK'. 



Pi. LXVn, FiK. 7. 



is<)4. PfenipJii/Iluni ailijurnicuni Fuiit. in Diiler c^ Stanton: Bull. (Jcol. Soc. Am., 

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



"Flor. Foss. Arct., Vol. V, Pt. II (Beitr.ige zur Foss. FI. Sibiriens und d. Amiirlande.s). pp. 19-20, pi. iv 

 figs. 10-16. 



''The list of species f^iveii in this paper eonluins tlie names without de.seriptions of all the plants that had 

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

 Fontaine and determined hy him. In his report which was sent to me on the 2.3d of F(4)ruary , lSi)4, and imme- 

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



" Plerophylhun cnJiforniciini n, sp., one specimen. This is a new specii's of that ty|)e of Pterophyllum which 

 is very characteristic of the Lower 'Cretaceous, and is illustrated by P. Brongniarti Morris, of the Wi'iiidcn of 

 northern (iermany. and by P. conchmum Heer, of thff Kome beds of (ireenlan<l. The siufjlc specimen, allliiiugh 

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

 described as follows: PltrophijUuin ralifoniiruiii. Leaf miknown: leaflets attached by a widened base to the 

 side of the midrib, going off at a large angle, approximating a right angle, falcately curved, varying irregidarly 

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



