PLATE XII .—Continued. 
Cyclonema? (Pleurotomaria ?) sp. ? 
Fig. 26. The back of a cast. From the Hamilton group, near Leonardsville, Madison county, N. Y. 
Cyclonema lirata. 
Page 35. 
Figs. 27-29. Three individuals, differing in size, but with the same character of surface. From the Ham¬ 
ilton group, Schoharie county, 1ST. Y. 
Cyclonema multilira. 
Figs. 30, 31. The opposite sides of the typical specimen. Hamilton, N. Y. 
Figs. 32, 33. Two views of an entire'specimen which is somewhat compressed. 
Cyclonema Hamilton^®. 
Page 37. 
Fig. 34. A specimen preserving the substance of the shell with the entire surface characters. Pratts Falls, 
Onondaga county, N. Y. 
Fig. 35. A cast showing a greater number of striae. Schoharie county, N. Y. 
Fig. 36. A specimen showing a line on the flattened portion at the top of the last volution. From the same 
locality. 
Cyclonema obsolescense 
Page 38. 
Fig. 37. A large cast showing the revolving carinae on the upper volutions, but which are scarcely visible 
oh the body-whorl. 
Cyclonema ooncinna. 
Page 38j 
Fig. 38. An internal cast showing- only the upper one of the bands. 
Fig. 39. A gutta-percha cast in the natural mold. The specimen shows no carinae on the body-volution, 
except that forming the upper angle, and again at the base of the volution. 
Fig. 40. Cast of a larger individual, with the. entire lower surface of the body-whorl marked by the carinae, 
and s only two strong ones on the upper volutions. 
* The specific name of obsoletet, originally given, is preoccupied. 
