PLATE LXI—Continued. 
Stictopora SINUOSA. 
Page -247. 
Fig-. 17. An enlargement, showing the form and disposition of the cell apertures, and the strong sinuous 
striations. (X 18.) 
Hamilton group. South of Auburn, on the shore of Cayuga lake, N. Y. 
Stictopora tumulosa. 
Page 246. 
An enlargement, showing slightly pustuliform cell apertures, separated by longitudinal stria¬ 
tions. (X 18.) 
An enlargement from another portion of the same frond, showing decidediy pustuliform cell aper¬ 
tures, irregularly disposed. (X 18.) 
Hamilton group. Vicinity of Geneseo, Livingston county, N. Y. 
An enlargement, showing the obtuse distal extremity of a specimen, and the disposition of the 
cell apertures in longitudinal parallel rows, separated by striations. (X 6.) 
A still further enlargement, showing more distinctly the pustuliform cell apertures. (X 18.) 
An enlargement from another specimen, showing a finely granulose surface. (X IS.) 
Hamilton group. Moscow, Livingston county, N. Y. 
Stictopora angularis. 
Page 252. 
Fig. 23. Au enlargement, showing both the oval and circular pustulose cell apertures, separated by longi¬ 
tudinal ridges. 
Hamilton group. Four miles south of Le Roy, N. Y. 
Stictopora scitula, n. sp. 
Fig. 24. An enlargement, showing the form and disposition of the cell apertures, and the longitudinal 
striations. (X 6.) 
Fig. 25. A still further enlargement, showing more distinctly the characters represented in tig. 24. (X 18.) 
Formation and locality. Niagara. group, Lockport, N. Y. 
This fossil is one of a collection purchased from the estate of the late Mr. Pickett of Rochester, N. Y., 
and was originally arranged with the collections of the Hamilton group, the specimen differing in no 
appreciable character from the Hamilton shale. It was only after it had been drawn and lithographed, 
that, finding no other specimen of the species in the extensive collections of the Hamilton group, critical 
attention was directed to it, when a small fragment of Spirifera Niagarensis was found in the shale, and 
from the presence of this fossil the Geological age has been determined. 
Stictopora trilineata. 
Page 243. 
An enlargement from near the base of the frond, showing the striations extending over the entire 
surface. (X ti.) 
An enlargement, showing the circular cell apertures, with equally elevated, smooth peristomes, 
and disposed in longitudinal parallel rows separated by striations. (X 18.) 
Hamilton group. Moscow, Livingston county, N. Y. 
Fig. 26. 
Fig. 27. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
