^"1893!"'] PROCEEDINGS OF THE NATIONAL MUSEUM. 113 



Haliserites lineatiis, s]». ii<)\ . 



Fronds dichotonioiis throuiL^hout; divisions linear, the larger members 

 ui)wards of 4""" broad, the terminal ramuli 1""" or less, and strict. 

 Divergence of members from lio to 50°. Costate throughout, costa not 

 prominent; margin regular. 



Haliserites chondriformis, sp. nov. 



Fronds dichotomous; divisions linear, the larger members sometimes 

 exhibiting an unusual form. Ultimate ramuli 2 to 3""" l)road, strict. 

 Principal angles of divergence 00^, those of tiie smaller members, 40^' to 

 550. Midrib obvious, becoming very prominent below ; the base of the 

 frond contracted into a narrow stipe; margins regular. 



The geueral aspect is that of Chondrus. 



(tOihis DICTYOTITES, gen. nov. 



Fronds plane, membranaceous, and regularly dichotomous, the ulti- 

 mate ramuli generally bifid. Midrib none, margins regular 



Dictyotites fasciolus, sji. nov. 



l^'ronds di<'h(>t(»moiis, divisions narrowly linear, 1 to 1.5'""' wide, and 

 generally aggregated in tufis. 



Dictyotites maximus, s]). nov.? 



Frond regularly dichotomous, the divisions linear, about 3""" broad. 

 Divergences of members about OOQ. Margins regular. 



Genus PSILOPHYTON Dn. 

 Psilophyton grandis, sp. nov. 



Stem 1.5'"'" in dianu^ter, branching dieliotomously into slender rami- 

 fications; angles of divergences narrow; terminations of branchlets cir- 

 cinate. Leaves in the form of spirally arranged, lanceolate, and acute 

 scjiles curved slightly upward, those of the main stem 2""" broad at the 

 base and 5""" long, distant 5""" ; those of the branches becoming smaller 

 and more closely aggregated, finally 1""" broad and 2"'"' long. Surface 

 markings as i)oorly defined pits or short longitudinal strije. Fruit 

 none. Plants chiefly foun<l as im[)ressions, rarely carbonized. 



EXPLANATION OF FIGURES. IMiitr.s ix-xiv. 



No. 1. Fragment of a fern? Similar to No. 25. N;itiir;il size. 

 No. 2. Fragment of !i fern? Rliaclii.s X |. 



No. 3. Leaves oi Schizoneura? or Home allied plant. Natural size. 

 No. '!. Ix'ootis or ])OHHibly llaHin'ritcn, Natural size. 

 No. .5. Grass-like JetlVN of uudeterrainable character. Natural size. 

 No. fi. Froud of BaHswiks JJeohenimm Gopp., t^ljowing n wavy niarf^iu, Naturftl 

 size , 



Proc. !(. M, 93 8 



