444 BERRY: SPECIES REFERRED TO THINNFELDIA 
THINNFELDIA? RETICULATA Font. in Ward, Older Mesozoic 
Fl. U. S., Ann. Rep. U. S. Geol. Surv. 207: 235. 
pi 22,7. 1,2... 1900 
Poor remains make this determination only provisional. It is 
undoubtedly a fern, however, possibly a new genus. The veins 
are strong and anastomose exactly as in Thinnfeldia variabilis 
Velen. Occurs in the Triassic near York Haven, Pennsylvania. 
THINNFELDIA ARCTICA Heer (incorrectly spelled Z/infeldia), 
Fl. Foss. Arct. 3: 123. pl. 35. f. 11-16; pl. 36. 
f. 106, 1874 
From the Cretaceous of Spitzbergen (Cape Staratschin) ; in- 
cluded here because of its resemblance to the upper pinnae of 
Thinnfeldia Fontainei, from which it differs only in the pinnules 
being more rounded at the apex. 
THINNFELDIA VARIABILIS Velen. Gymnosp. Bohm. Kreidef. 
Of 2. 7, 15; p..3: Ff. T2. 188s + Hollick, Bull. 
N. Y. Bot. Gard. 2: 403. pl. gz. f. 12. 1902 
This species is listed by Velenovsky under ‘“ Species Incertae 
Sedis.”” While it may not be a fern the venation is not that of 4 
coniferous plant, and it may best be left in this genus provision- 
ally; although in so doing the genus is brought down to the mid- 
Cretaceous, which is undesirable as this species has nothing in 
common with the other species and is undoubtedly generically 
distinct. Hollick’s remains from the Cretaceous of Chappa- 
quidick Island, Mass., are indistinguishable from the type. 
PHYLLOCLADOPSIS Font. Potomac Flora, 204. 1889 
For the sake of completeness in the enumeration of American 
Phyllocladian remains I append a short notice of the following 
species. 
PHYLLOCLADOPSIS HETEROPHYLLA Font. Potomac Flora, 204- 
pl. 84. f. 55 pl. 167. f. 4. 1889 
The thick texture and immersed venation are those of Phyllo- 
cladus, but the outline and margin are different ; the general aspect 
is decidedly not that of a fern. But for the diverging veins to the 
