BUFFALO SOCIETY OF NATURAL SCIENCES 17 
ERIONIODUS ERRATICUS, HINDE 
Plate bi nic lO Rlarem Ville tical: 
1879. Prioniodus erraticus, G. J. Hinde, Quart. Jour. Geol. Soc., Vol. 
XDOXGV pS 9 bla emeGV re tions 
In such examples as | have procured from the Conodont bed 
the denticles vary in number, size and spacing, in some specimens 
being rather widely separated from each other, while in others 
they are closely crowded together. I figure two specimens which 
represent the extreme variant from Dr. Hinde’s type. 
ERIONIODWS TAN GUIEAIN OSs eins, 
1879. Prioniodus angulatus, G. J. Hinde, Quart. Jour. Geol. Soc., 
Vol. XXXV, p. 360, Plate XV, fig. 17. 
Dr. Hinde says in his description that he collected this species 
from the Genesee shales in Eighteen Mile Creek at North Evans, 
New York, and from the Cleveland shales at Bedford, Ohio. 
Genesee shales do occur at North Evans. They are soft, gray in 
color and above them le the black bituminous shales of the 
Portage group. It was almost certainly from these Portage beds 
that Dr. Hinde collected his specimens. I have found this species 
in the Rhinestreet (Portage) shale, near Sturgeon Point, N. Y. 
It does not seem to occur in the Conodont bed, but certain 
examples of P. clavatus closely approach it. 
PRIONIODUS COLLIGATUS, Spec. Nov. 
Pilate PE mies, 1 2 and 4; Plate V. figs. 6 and 10: Plate V1. fic. 8: 
plate. Valile fies? 2) and: 
Base long, narrow and more or less arched. Often produced 
below about the central cavity, from which a groove extends the 
length of the base. Main cusp short, compressed, and not much 
larger than the other denticles. [hese are closely opposed to 
each other, rather long, flattened and blunt. They are often 
neatly graduated in height, with hardly any tapering of the 
individual denticles. They may number as many as eight or ten 
on either side of the main tooth. 
This species is common in the Conodont bed at Eighteen Mile 
Gicel= 
PRIONIODUS RETUSUS, Spec. Nov. 
inte E tase cuands9 alate Vries. OPand: will late: Vles ices: 
A robust species, with short, thick base, arched and produced 
below the main cusp. This is stout, blunt, circular or ovoid in 
cross section, as are the robust denticles. There are not more 
than five or six of these on either side of the main tooth, and 
they are rather closely arranged and obtusely pointed. This 
species is not uncommon in the Conodont bed of Eighteen Mile 
Creek. 
