20 THE GENESEE CONODONTS 
PRONTO DCS ka SiAsh OSs sSraces None 
Pievwe INO, mee, Oe Pare Wil, ier, 7. 
Base more or less sigmoidally arched, narrow and flattened. 
Viewed from above one end broadly expanded, the other narrow... 
The expanded end carries a crest-like row of tall, closely crowded 
and somewhat compressed teeth. These are followed on the 
narrowed portion of the base by a row of very short blunted 
denticles. On the underside of the base, beneath the largest of 
the crested teeth is a lozenge-shaped cavity, from which a groove 
runs to either end. 
As in all of the species of the genus the number of the denticles 
is variable, and in some specimens the expanded end is abruptly 
depressed. 
From the Conodont bed at Eighteen Mile Creek, Erie County, 
NEE 
PRIONIODUS OBIUSUS, Spec Nov 
leNevS. JUBE sayer, GS Iilevee WAL inex, 1: 
Base narrow, straight for the greater part of its length, with 
one end deflected downward. Main tooth very broad, com- 
pressed, blunted, wider above than below, and produced into a 
spur beneath the base. On one side of this main cusp are 
arranged a number of tall slender denticles; on the other side, 
the denticles are short, crowded, robust and obtuse. 
I collected this form from the Conodont bed, where it is 
rather uncommon. 
PRIONIODUSs DEAT US; SeEcsNov 
Plate Vale ics. 3.04 andilale 
Base as seen from the side with a somewhat sigmoidal curva- 
ture. As seen from above one end is narrow, the other very 
broad and expanded; the widest portion of the plate being not 
far from the extremity. This base supports a single row of stout, 
well-spaced, conical teeth. The underside is very deeply and 
widely excavated, the cavity being larger and deeper than in any 
other Conodont known to me. 
In the examples here figured the teeth are mostly broken but 
the basal cavity is directly beneath the largest tooth of the series 
on the widest portion of the plate and probably extends a short 
distance into it. I have collected several specimens of this rare 
species from the Conodont bed at Eighteen Mile Creek, Erie 
Gouin News 
PRIONIODUS RARVULUS, Sree Nov 
Pe IDX. 
In the upper layers of the Genundewah limestone, Conodonts 
are rare. The specimens illustrated on Plate IX seem to represent 
