i66 The American Geologist. M&vch, 1903. 
Middle Devonic, appears to be either from the Helderbergian 
or a somewhat lower horizon in the Eureka section of Ne- 
vada. C. jerseyensis was also collected in the Cobleskill at 
Schoharie by Gebhard and may be seen in the collection of 
the Brooklyn Institute. The writer found it on Wheelock's 
farm, Litchfield, Herkimer county, New York, near Selins- 
grove, Pennsylvania, and Cumberland, Md. At all of these lo- 
calities it occurs at a horizon about equivalent to the Cobleskill 
and appears to be the most constant and reliable indicator for 
this horizon. 
Spirifer eriensis Grabau, 
Spirifer sp., Hall, Nat. Hist. N. Y., Pal., 11, 1852, p. 327, pi. 74, figs. 
8a-8d f specimens in Amer. Miis. Nat. Hist., No. '"VO- 
Spirifer eriensis Grabau, Bull. Geol. Soc. Amer., XI, 1900, p. 366, pi. 
21,. figs. 2a, 2b. 
This shell from Herkimer county and Schoharie is very 
closely related to S. modestus of Maryland (this species is 
restricted to the Manlius), and it is a question whether the two 
forms are distinct. S. modestus may have a few more plica- 
tions, but these as a rule are nearly obsolete, though fully 
twenty-five per cent of the specimens have them as strongly 
developed as in 6". eriensis. It is found also in the "Water- 
lime" (Rondout) at Schoharie. 
Spirifer modestus corallinensis (Grabau'. 
Spirifer crispiis Hall (non Hisinger), Nat. Hist. N. Y., Pal., H, 1852, 
p. 328, pi. 74, figs, ga-gb. 
Spirifer crispus var. corraUncnsis Grabau, Bull. GeoL Soc. Amer., XI, 
1900, p. 352 (the varietal name is improperly constructed). 
This is not the Rochester shale v9. crispus which has well 
developed plications and from which 6". vanuxemi apparently 
descended. This Cobleskill species is almost devoid of plica- 
tions and is closely related to S. modestus of the Maryland 
Manlius. The latter is always a larger shell and as a rule is 
more subquadrate, with a tendency to have distinct plications. 
It is also a common shell about Litchfield, Herkimer county, 
New York. 
Whitfieldella (?) nucleoiata (Hall). 
Atrvpa nuclcolafa Hall. Nat. Hist. N. Y., Pal., II, 1852, p. 328, pi. 7.4, 
figs. lOa-iom. 
Whitfieldella cf. rotiindata Grabau. Bull. Geol. Soc. Amer., XI, 1900, 
368, pi. 22, figs. 3a, 3b. 
