BUFFALO SOCIETY OF NATURAL SCIENCES 19 
I believe that this species can be found at Eighteen Mile Creek 
only in rocks of Portage age. It is not uncommon in the Rhine- 
street shale, but | have not as yet found it in the Genesee. Its 
closest ally is P. erraticus. 
PRLONTO DUS SLIiCGAwh WSs EUUINIDiE 
1879. Prioniodus spicatus, G. J. Hinde, Quart. Journ. Geol. Soc., 
Vol. XXXV, p. 361, Plate XVI, figs.-1, 2, 3 
1886. Prioniodus spicatus, J. M. Clarke, Report of the State Geologist 
for 1885, Albany, N. Y., Plate A-1, fig. 22. 
It is probable that this, like the preceding species, was in- 
correctly. referred by Dr. Hinde to the Genesee. It does not 
Seem) to occun) ine the Conodont bed) but Dr |. Me Clarkes has 
figured an example from the Portage (Naples beds) in Ontario 
County, N. Y., and I[ have collected it from the Rhinestreet shale 
MEARE SCON le Oilty Ne Xe: 
PRIONIODUS IMMERSUS, HINDE 
Plate VI, fig. 2. 
1879. Polygnathus immersus, G. J. Hinde, Quart. Journ. Geol. Soc., 
VOODOO pa S64) Pilate: GVM fio 2h 
In this species the teeth are set upon a transparent base. The 
denticles are quite flattened and viewed by transmitted light they 
appear to be imbedded up to their tips in the base, or to be con- 
nected by a thin, transparent web. Part of this appearance is 
due to the pigmentation of the interior of the denticle, which 
extends downward into the base. This fusion or union of the 
denticles by a transparent webbing often occurs in other species 
of Conodonts. Thus it is found in nearly all of the crest-like 
teeth terminating the tuberculated plates in the genus Polygnathus. 
It 1s also common in specimens of P. radiatus and P. alatus. The 
photographs taken by reflected light do not show this “immersed” 
condition very clearly. My specimens which show considerable 
variation, are all from the Conodont bed; while Dr. Hinde’s 
types were collected from black shales on the Canadian shores 
of Lakes Erie and Huron. 
RRI@NMODUS NASUAN Ss ENN Dik: 
1879. Polygnathus nasutus, G. J. Hinde, Quart. Journ. Geol. Soc., 
Nol XOXOOVE ps 3645 Plate XOVIi ig. 22) 
This form seems to me to belong in the genus Prioniodus, 
‘being allied in the character of the main cusp to P. alatus. 
Hinde’s type came from the shales at Eighteen Mile Creek 
(Portage?). I have found it or something very like it in the 
Conodont bed. 
