warp] TRIASSIC FLORA OF YORK COUNTY, PENNSYLVANIA. 285 
described, and the Little Conewago Creek shales, encouraged the hope 
that like deposits might be found elsewhere and still further enrich 
the contributions to the flora of York County. 
It was mainly due to that expectation, a vain one thus tar, that the 
writer did not publish the results of his geological explorations years 
ago, when he first discovered the York Haven locality. 
DESCRIPTIONS OF THE SPECIES. 
Subkingdom PTERIDOPHYTA (Ferns and Fern Allies). 
Class FILICALES. 
Family FILICES (Ferns). 
Genus THINNFELDIA Ettingshausen. 
THINNFELDIA ? RETICULATA Fontaine n. sp. 
PL. XXII, Figs. 1, 2. 
Professor Fontaine says of this plant: 
This is a fragment of what seems to be a new speciesof fern. It isa portion of the 
terminal part of an ultimate pinna. The plant does not show enough for one to 
make out its true character. The nerves anastomose in an irregular manner. It has 
the general aspect of a Thinnfeldia, and but for the anastomosis of the nerves might 
without hesitation be placed in that genus. 
As the portion is from the upper part of the frond, the pinnules probably differ 
from the normal ones lower down on the plant, and hence the true character may not, 
be disclosed. ‘There is a midnerve at the base of the pinnules, but it splits up into 
branches. Lateral nerves go off on eavh side of it from the main rachis very obliquely. 
All the nerves are strong and distinct. They anastomose irregularly at long intervals 
and form elongate meshes. 
It is without doubt a new species and may be a new genus. Provisionally it may 
be called Thinnfeldia reticulata. 
Mr. Wanner makes this statement: 
The lobes are decurrent and the rachis winged. Fig. 2, Pl. XXII, shows the 
anastomosing nervation. More specimens are needed better to define it. 
Locality.—N. C. R. R. cut, south of York Haven. 
Genus CLADOPHLEBIS Brongniart. 
CLADOPHLEBIS RETICULATA Fontaine n. sp. 
Pl. XXI. 
Professor Fontaine’s description of this species is as follows: 
This is a fine specimen of a new and interesting fern. Mr. Wanner’s Fig. 1 gives 
a good idea of the appearance of the largest specimen as seen with all accidental 
imperfections. I have attempted in Fig. 3 to indicate its character as seen under the 
lens and omitting accidental imperfections., Figs. 4,5 give the basal and terminal 
