PTEROPODA. 
7 
HyOLITHES herds, 11 . sp. 
PLATE CXIV, FIGS. 24-27. 
This species is characterized by its large size, broadly crenulated lateral mar¬ 
gins, and its finely and closely striated dorsal or convex surface. 
Lower Helderberg group. Near Clarksville, Albany county. 
STYLIOLA, Lesueur. 1826. 
(See Vol. V, part ii, pp. 175-182.) 
Styliola spica, n. sp. 
PLATE CXIV, FIG. 28. 
This species differs from S. fissurella, Hall, of the Hamilton and Portage 
groups, in its much greater size, more robust form, and in the absence of any 
indications of annulations or apical node. 
Hamilton group. Hamburgh, Erie county. 
COLEOLUS, Hall. 1879. 
(See Vol, V, part ii, pp. 184-190.) 
COLEOLUS HeRZERI, 11. Sp. 
PLATE CXIV, FIG. 29. 
The shell of this species is of unusually large size, slightly incurved toward 
the apex, and the surface is marked by low, faint, obsolescent and somewhat 
irregular striations. 
Waverly group. Medina county, Ohio. 
PHARETRELLA, nov. gen. 
Shell large, elongate, Hyolithes-like in outline; apex acute, transverse section 
probably triangular; substance tenuous; ornamentation consisting of trans¬ 
verse, imbricating undulating strim. 
Pharetrella tenebrosa, n. sp. 
PLATE CXIV,',PIGS.I30,L31. 
Genesee slate. Genesee county. 
