25 
From a 4-foot sand-stone stratum interlaid between 
two heavy strata of red clay.—Coal Measures, Marietta, O. 
Psaronius gunceus, Nov. Spec. 
(Plate III.) 
As has been shown in one of our former meetings, 
Psaronius is not a conical stalk of aerial roots, enclosing 
the base of tree-ferns, but it is a plant per se. We present 
the one before us as a new species, having in its central 
arrangement the structure of a fern or Sigillaria or likely 
a Lepidodendron; for all these characters are closely allied 
to each other; but also being remarkably made up of cel- 
lular fascicles, enclosing like individuals that center and 
joining each other so densely, as to leave no interstinct 
tissue between them. [Fach fascicle is throughout the whole 
trunk, which attains the thickness of 14 in., as thin and 
slender as bulrushes, from ;3, to } inch thick, crowding 
each other in various angles. In each fascicle is a starlike 
center of coarse woody cells, surrounded by small circular 
cells The main- center, 2 inches in diameter and being a 
pithy cylinder, has the same long vermicular woody bundles 
as are common to the abovementioned trees. 
Psaronius is abrupt truncate, having a wide, deep 
crateriform cup or basin; from each fascicle issued a leaf 
and from the depth of the center a shaft bearing the sporifer— 
ous fructification. Our specimen bears remarkably four 
notches of branches as offshoots from the exterior in quin— 
cunx arrangement.—Mahoning Sandstone, Athens Co., 
Ohio. 
Arthrophycus, Hall. Arthrophycus elegans, Nov. Spec. 
This species of seaweed is very similar to Arthro- 
phycus Harlani of the Medina sand-stone; its close division 
of branching and transverse furrows or ridges bring it in 
close relation with the former; only that the new species 
is of very dense growth, with more graceful and slender 
branches and closer and deeper furrows. The marks left 
in the rock look much as if stems of crinoids of various 
