TWO NEW specip:s of alg.e of the genus BUTHO- 
TREPHIS. FROM THE UPPER SILURIAN OF INDIANA. 
By David White, 
Cu8f(xlian of Paleozoic PlanU. 
The specimens which form the subject of this paper were collected 
by ]\lr. C. E. Newlin from the Eiuypterid beds at Kokomo, Indiana, 
and were communicated by Dr. E. M. Kindle, assistant State geolog-ist. 
The Eurypterid beds are correlated with the Rondout of Schuchert 
and Clarke, and the fossils are therefore nearl}' contemporaneous 
with the closel}' allied species Buthotrephm lesque'reuxii Gi'ote and Pitt, 
from the Waterlime of western New York. 
The orig-inal of Plate XVII. Bvthotrtq)hli< ■nerdlnL is in the Paleo- 
zoic plant collection of the U. S. National Museum. The type of B. 
divarleatd, Plate XYI. is in the private collection of Mr. Newlin in 
Irvington, Indiana. 
The characters of the specimens in hand will first be described before 
entering upon a discussion of the nature or affinities of the genus 
BntliofiU'ph'ix. 
BUTHOTREPHIS DIVARICATA, new species. 
(Plate XVI. ) 
Fronds very openly fasciculate from a Inroad attachment; lamina 
relatively broad, sinuately curved, two or three times dichotomous, 
beginning near the base, the distance between the bifurcations being 
about three times the width of the lamina, which is of nearly equal 
breadth at all points; divisions and lobes divaricate, usually at a wide 
ang-le, and outward curved; lobes rounded or round-truncate at the 
apex, which is slightly denser; carbonaceous residue thin, rug-ulose 
or minutely granulose, and marked, especially along the medial por- 
tion, by very delicate, irreg'ularh^ but more or less obliquely, arranged 
trichomatose or filamentose ( '.) impressions. 
The aspect and general features of this well-marked species are well 
shown in the photographic illustration, Plate XVI, which represents 
the only specimen of this type communicated. The most salient char- 
acters are the divaricate position of the subdivisions of the frond at 
Proceedings U. S. National Museum, Vol. XXIV— No. 1255. 
265 
