BUFFALO SOCIETY OF NATURAL SCIENCES 21 
a single new and distinct species and may very well have belonged 
to one individual as they were found associated together on a 
slab less than.three inches square, which | collected from the 
upper surface of this limestone. 
The base in this species is short, slightly arched, and some- 
what convex. It supports at one end a short wide and robust 
tooth, following which is a series of stout and obtuse denticles 
sometimes but little inferior in size to the main cusp. A single 
denticle is usually attached to the outer side of the principal tooth. 
This is one of the smallest species of the genus. My figures 
show the variations which may, perhaps, occur in the teeth of 
one individual. In some specimens the main cusp is hardly to 
be distinguished from the following denticles, while in other 
examples it is quite pronounced. 
CPNRRODUWS CORO NAMUS AEeINID Is 
1879. Polygnathus coronatus, G. J. Hinde, Quart. Journ. Geol. Soc., 
Wi DOXOGVia pao Oo elatey OVE sshigael 
I see no reason for placing this form with Polygnathus. It 
possesses all the characters of Pander’s genus Centrodus and, 
as Hinde himself remarks, 1s very close to Centrodus convexus. 
In fact, Pander included within the same species much more 
variable forms than these two. Hunde refers this species to the 
Genesee shales, but it probably came from the Portage. I have 
specimens of it from the Rhinestreet shales at Sturgeon Point, 
INS 
CENDRODUS INVALELDUS Sree Nov: 
Plate III, figs. 3 and 5. 
This form very closely resembles Pander’s Centrodus simplex, 
and certain of the pectinate teeth included in the group which 
Hinde named Polygnathus dubius. It is quite possible that all 
of these teeth may have belonged to one individual, but equally 
possible that their association together may have been the result 
of their original owners, perhaps of several genera, having become 
the food of contemporaneous, larger fishes. I once collected a 
slab of Rhinestreet shale, which within the space of four square 
inches contained a great many Conodonts, together with crushed 
and broken integumentary plates and a few Lingula valves. The 
specimen contained many, but by no means all of the forms 
figured by Hinde and Clark, as Polygnathus dubius, together 
with teeth which have been described under different genera and 
species. 
If these Conodonts all belonged to one individual, the animal 
must have been so large that it is astonishing that no other 
