New Species of Fossil Plants. 423 
natifid; pinne pinnatifid above; pinnules lanceolate, one 
inch long, enlarged at the base; united together and decur- 
rent above, distinct below ; deeply undulate on the margins ; 
secondary nerves obsolete, very slender and oblique; bifur- 
cate, slightly arched. 
94. ALETHOPTERIS SERRULA (spec. nov.). Frond pinnati- 
fid, large; pinnules alternate sessile, perpendicular to the 
rachis or inclined backwards, straight, linear, four inches long 
and more, pinnately lobed ; lobes alternate, two to three times 
toothed, sometimes entire and obtuse ; secondary nerves 
once or twice forking. 
55. ArnrETHOPTERIS LEVIS (spec. nov?). Differs from Ale- 
thopteris nervosa only by its shorter pinnules and entirely 
smooth surface, without any trace of nerves; (an species 
propria.) 
Genus CALLIPTERIS. Brongt. 
96. Catuiprerrs SuLLIVANTII (spec. nov.). Frond bipin- 
nate ; pinna lanceolate; pinnules alternate, oblique, obovate 
or oblong, nearly contiguous, slightly decurrent, and united 
together near the base by a slightly obtuse sinus ; medial nerve 
broad, canaliculate, disappearing at the middle ; secondary 
nerves arched, slender, close, many times forking. 
Genus PECOPTERIS. Brongt. 
91. Pecopreris pisrans (spec. nov.). Has the nervation 
of Pecopteris polymorpha; differs from it by its distant pin- 
nules, oval, lanceolate, narrowed at the base, and attached to 
-the rachis only by the thickened medial nerve. a 
98. Pecorreris vELUTINA (spec. nov.). Frond : bipin- 
natifid ; lower pinns perpendicular to the rachis, pinnate, 
broadly linear-lanceolate ; 14 to 2 inches long; pinnules dis- 
tinet, slightly contracted in the middle, and enlarged above 
the base, sessile, united only at the summit of the pinnze ; 
Upper pinnz simple, pinnately undulate, lobed, or entire; 
* 
