BUFFALO SOCIETY OF NATURAL SCIENCES 27 
plates which are all from the Conodont bed. Text figure 7 shows 
a specimen cemented by its upper surface to a fragmentary plate 
of an undescribed fish, perhaps an Arthrodire. 
The nearest related form to this species is Polygnathus crassus, 
Hinde, described from a plate seen in profile. It is even possible 
that the species are identical. 
The specimen figured by Hinde on his Plate XVII, fig. 10, as 
probably belonging to Polygnathus tuberculatus is no doubt the 
reverse side of this species. 
POLYGNATHUS CALATUS, Spec. Nov. 
Plate XIII, figs. 1-13. 
Plates large and massive attaining a length of three milli- 
meters. Irregular in outline, sometimes diamond-shaped, some- 
times sigmoidal, with a prominent medium keel of robust teeth 
or tubercules. Superficial ornament consisting of prominent 
elongated nodes or tubercules and ridges usually disposed at 
right angles to the central keel and extending to the margin. 
While there is considerable variation among these plates, their 
robust proportions and general aspect lead me to believe that 
they may all be referred to the same species. This is the largest 
form on record. My examples all came from the Conodont bed 
at Mighteen Mile Creek, Mrie County, N: Y. 
POLYGNATEOS -SOLIDUS, EIEN DE 
Plate Vill. figs: 7-10.12) 
1879. Polygnathus solidus, G.. J. Hinde, Quart. Journ. Geol. Soc. 
Viel POO ps0 alate PeVelliiatios Ze 
Although this form differs from the typical Polygnathus in 
the absence of a tritor, yet because of its resemblance to the 
terminal crests of most species of this genus, I believe Dr. Hinde 
was correct in placing it therein. Some specimens may, indeed, 
be such detached crests but certain of them have a basal pit 
centrally located, indicating that the plates are entire. The form 
is typical of the Conodont bed. 
The following forms described by Dr. Hinde as from the 
Genesee shales probably occur only in the Portage. At least a 
careful search extending over several years has failed to locate 
them in the rocks of Genesee age. 
Polygnathus ? duplicatus. 
Polygnathus ? serratus. 
Polygnathus ? criensis. 
Polygnathus curvatus. 
Polygnathus palmatus. 
