DEVONIAN SECTION OF ITHACA, N. Y. 103 
which has come to light in noting the subgeneric differences indicated 
by the names Leptostrophia H. and C. and Douvillina Oehlert, is 
that the species characteristic of the Chemung fauna of New York, 
is the one originally described by Conrad from Chemung Narrows. 
This species belongs to the subgenus Douvillina and is properly there- 
fore named Stropheodonta (Douvillina) mucronata (Con.). | 
All the faunules collected by the writer’s party in the Watkin’s 
Glen and Catatonk quadrangles which contain this species offer no 
evidence to contradict their reference to the Chemung fauna and 
Chemung formations as defined in this paper. No case has been 
discovered by them of the presence of the species at a horizon below 
the Chemung base. In the two quadrangles 183 faunules have been 
examined containing this species and of none of them is there any 
reasonable doubt (either structural or paleontological) as to their 
stratigraphic position above the Nunda-Chemung boundary as estab- 
lished in this classification. 
A faunule from Marathon reservior, R. Ruedemann collector, 
No. 2499, is reported by J. M. Clarke as belonging to the “Ithaca 
beds.”* Although the altitude is not given several of the species 
named do not indicate a horizon so low as the Ithaca. ‘The species 
listed are: 
Tentaculites sp. incert; Actinopteria eta. (Hall); Pterinea chemungensis (Con.); 
Grammysia bisulcata (Con.); Microdon bellistriatus (Con.); Nucula varicosa 
(Hall ?); Palaeoneilo emarginata (Con.); P. tenuistriata (Hall); P. sp. incert; 
Schizophoria impressa (Hall); Leptostrophia mucronata (Con.); Stropheodonta 
cayuta (Hall); Sir. cf demissa (Con.); Chonetes scitula (Hall); Productella 
lachrymosa (Con.); P. sp. incert.; Spirifer mucronatus (Con.); S. mzcronatus 
posterus (H. and C.); S. mesastrialis (Hall); S. laevis (Hall); Atrypa reticularis; 
Cyrtina hamiltonensis var. recta (Hall); Pugnax pugnus var. altus Calv.; Leior- 
hynchus globuliformis (Van); Strictopora gilberti; Hederella; Plumalina pluma- 
rea (Hall); Taxocrinus; Auloprora; Boring sponge; Lepidodendron; Dadoxylon. 
The species whose place in this list seem to the writer questionable 
are Pterinea chemungensis, Stropheodonta cayuta, and Productella 
lachrymosa. If these species are correctly identified and occur in 
association with the other species listed they are not in accord with 
the evidence gathered by our party at Marathon, and in fact through- 
out the whole of the Catatonk quadrangle. 
tN. Y. State Mus. Bull. 82, pp. 59 ff. 
