106 HENRY SHALER WILLIAMS 
but no faunule has been discovered in the Harford quadrangle con- 
taining a species of Dalmanella. 
Clarke cites no case of a Dalmanella in the list of species recorded 
from Central New York in the Ithaca fauna.t I have not observed 
in the various papers written by C. D. Prosser any report of a species 
of Dalmanella (or a species recorded under the name Orthis, now 
known to be Dalmanella) from the Devonian of Chenango Valley 
or further east in New York State, except the one case of Orthis 
lenticularis Van., from Chapman’s Quarry, Babcock Hill, which is 
a typical Corniferous limestone.? 
These facts indicate that eastward of the Ithaca meridian Dal- 
manella rapidly becomes rare and is rarely seen in Upper Devonian 
faunas beyond the Apalachin quadrangle eastward. 
Tracing the evidence westward Clarke cites the species Orthis 
infera Calvin, which is a Dalmanella, from the fauna of the High 
point sandstone of Naples.3 This species is small and closely 
related to Orthis leonensis. From the same fauna are cited also 
Stropheodonta cayuta and Spirifer disjunctus, thus leaving no doubt | 
as to the Chemung character of the fauna. 
In the Genesee Valley the genus is frequeatly met with in associa- 
tion with typical Chemung faunules.4 In only one case in that bulletin 
is it reported from a doubtful horizon. This is the case of the 
shales at Hornellsville, Station No. 494. Here it occurs with Car- 
diola (Buchiola) speciosa and other species of the Nunda fauna. 
It is followed immediately by beds carrying Spirijer disjunctus. 
The species there is Dalmanella leonensis. ‘This, with our present 
knowledge, locates the Hornell horizon in the Dalmanella leonensis 
zone at the base of the Cayuta member of the Chemung. A similar 
association takes place in the early faunules of the Watkins Glen 
and Elmira quadrangles, which indicates an over-lapping of the 
Nunda species upon the first incursion of the Chemung fauna. 
Still farther west in Chautauqua County the earlier Chemung faunas 
t“Tthaca Fauna of Central New York,” N. Y. State Mus. Bull. 82, pp. 
o3mlee 
2“Tevonian Section of Central New York,” N. Y. State Geol. Twelfth Ann. 
Rept. (1894), p. 5. 
3.N. Y. State Mus. Bull. 63, p. 64. 
4U. S. Geol. Survey, Bull. 41, pp. 30, 67, 69, 74, 76, 80, 85. 
ETI 
