BUFFALO SOCIETY OF NATURAL SCIENCES 13 
to repeated washings and boiled with the addition of washing 
soda, and the resulting sand was found to be exceedingly rich 
in Conodonts, they making up nearly one-half of the mass. 
Although much of the material was broken, beautifully pre- 
served examples were plentiful and these were picked out, trans- 
ferred to slides and mounted so as to exhibit the superior, 
inferior and profile aspects of a series of all the forms herein 
illustrated. 

Fig. 3. Prioniodus recedens, Bryant. X 25, 
PRIONIODUS RECEDENS, Spec. Nov. 
Mextuilg-coseeblate, leenes.al-2. O-14eemlate: Mile mimes: l=4 7.09) 
It is clear that any attempt to classify these obscure fossils 
will have more palaeontological than zoological value. The 
simplest form from the Conodont bed consists of a single robust, 
curved and blunted tooth, nearly circular in cross section, arising 
from a somewhat expanded, hollow base. 
The cavity beneath the base is lined with smooth polished 
walls and apparently extends but a short distance upwards into 
the tooth. Plate III, fig 7, shows a thin section of a related 
species, cut so as to bisect this cavity, but not illuminated to show 
the lamellar structure of the tooth. The base 1s convex on one 
side and concave on the other and from this fact it 1s easy to 
determine that these teeth must have been symmetrically arranged 
in pairs, as both rights and lefts are to be seen on Plate I. 
Were some of these teeth to be found isolated, one would 
place them in Pander’s genus, Drepanodus; but when one exam- 
ines a series, it is at once apparent that they merge insensibly 
into other forms. The base gradually lengthens into a narrow 
arch upon which is supported, on either side of the main cusp, 
a row of smaller, blunted denticles. These denticles vary in 
number with the growth of the base and their quantity seems 
to result from what Professor Owen used to term a vegetative 
repetition of parts. 
