Maiiliiis Forniation of Neur York. — Schuchert. 
167 
In Herkimer county this species is associated with W. (?) 
sulcata. 
Whitfieldella (?) sulcata (Vanuxem). 
Atrypa sulcata Vamixem, Geol. N. Y., Rep. Third Dist., 1842, p. 112. 
fig. 5. — • Hall, Ibidem, Fourth Dist., 1843, p. 142, fig. 5. 
Merista hisulcata Hall, Nat. Hist. N. Y., Pal., HI, 1859, P- 253 (error 
for Vanuxem's A. sulcata) 
Whitfieldella sulcata Grabau, Bull. Geol. Soc. Amer., XI, 1900, p. 
367, pi. 22, figs. 2a-2d. 
This is a characteristic shell of the Cobleskill. It occurs 
commonly about Litchfield, New York. 
Rhynchonella (?) lamellata (Hall). 
Atrypa lamellata Hall, Nat. Hist. N. Y., Pal, II, 1852, p. 329, pi. 74, 
figs, iia-iih. 
Also found in the "Waterlime" (Rondout) at Schoharie 
and in the Cobleskill about Litchfield, N. Y. This shell has 
an extended distribution in New Jersey, Pennsylvania, Mary- 
land, and West Virginia. In New York it does not appear 
to pass far above the Cobleskill but in Maryland it ranges 
through 400 feet of the upper Salina and through 50 feet or 
more of the lower Manlius. 
Rhynchonella (?) litchfieldensis n. sp. 
Atrypa sp., Hall, Nat. Hist. N. Y., Pal., II, 1852, p. 330, pi. 74, figs, iii 
and 12. 
This species is one of a group represented in the Rochester 
shales by R. (?) neglecta and in the Helderbergian by R. (?) 
transversa. It differs from the former in having more plica- 
tions with the fold and sinus narrower and less pronounced. 
It is more closely related to R. (?) transversa, but never at- 
tains the size of this species, nor is the fold and sinus so broad. 
The figured specimen i's from Wheelock's farm, Litchfield 
township, Herkimer county. New York, and is in the U. S. 
National Museum. (No. 34634.) 
