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PALEONTOLOGY OF NEW-YORK. 
This species occurs in the lower beds of the Chemung group near Trumans- 
burgh, and at the Inclined Plane near Ithaca; at Painted-post and along the line 
of the Blossburgh railroad to Pennsylvania; at Grass-valley and Connewango in 
Cattaraugus county; at several localities in Chautaqua county, New-York,-and 
at Meadville, Pennsylvania. 
Chonetes lepida. 
PLATE XXII. 
[Chonetes lepida, p. 132 of this volume.] 
This species occurs in the Chemung group, mostly in the condition of 
casts; and is distinguished from the casts of C. scitula by its smaller size 
and mesial depression. 
In one or two localities it has been found with the shell preserved, 
and will probably be found in this condition in many places in the 
freshly quarried stone, beyond the influence of the weather. 
The principal localities where it has been observed in this group are 
Great-valley and Connewango in Cattaraugus county, and Forestville in 
Chautauqua county. Rarely it has been observed in the specimens from 
Meadville, Pennsylvania. 
Chonetes setigera. 
PLATE XXII.f 
[Chonetes setigera, p. 129 of this volume.] 
This species, which occurs in the Marcellus and Genesee slates, has 
not been found among the collections from the Chemung group in New- 
York; but it occurs associated with C. scitula, and other fossils of the 
Chemung group, at Meadville, Pennsylvania. 
The specimens consist of casts of the ventral valve and impressions of 
the exterior of both valves. When the cardinal spines are present, the 
species is readily identified; but it may be distinguished from C. scitula 
by its greater proportional length, and by the rounded coarser striae, and 
usually greater convexity of the ventral valve towards the apex. 
