172 Annals ok thk Carnegie Museum. 



A few fragments of this species, showing the usual surface marking, 

 were found. The species has been reported from Thedford, is fairly 

 common at the base of the Hamilton and Eighteen" Mile Creek, and 

 occurs in all the sections under examination. 



Cyclone ma luxmiltflnice Hall. 



Pal. N. Y., Vol. V, pt. 2, p. 37. 

 A single specimen is referred doubtfully to this s])ecies. 

 Bellerophoii led a Hall. 



Pal. N. Y., Vol. V, pt. 2, p. no, pi. 23. 

 Specimens of this shell are cjuite numerous and the largest is of 

 about the usual size for the species. It is found in the sections from 

 Eighteen Mile Creek to Cayuga Lake. 

 Platyceras bucculentum Hall. 



Pal. N. Y., Vol. V, pt. 2, p. 10, pi. 3. 

 There are numerous small specimens in the collection which agree 

 with Hall's figures of this species, except that they do not have the 

 strong folds at the aperture. The species is found from Thedford to 

 Otsego county. 



Platyceras carinatus Hall. 



Pal. N. Y., Vol. V, pt. 2, p. 5, pi. 2. 



Most of the specimens are small, but show the characteristic features. 

 The species is found from Eighteen Mile Creek to Albany county. 



Platyceras symnietriciim Hall. 

 Pal. N. Y., Vol. V, pt. 2, p. 9. 



Specimens of this species are common, but very few show the com- 

 plete aperture. The species is rare in the lower Hamilton at Eighteen 

 Mile Creek and fairly common in the upper part of the Livonia section. 



Diaphorosfiuiia lineata Conrad. 



Pal. N. Y., Vol. V, pt. 2, p. 21, pi. 10. 



All the specimens are quite small, the largest being only 12 mm. in 

 greatest diameter and showing three whorls. The species is common 

 here as it is at Eighteen Mile Creek, Livonia, and Cayuga Lake. At 

 Thedford it is rare, although it occurs all through the section. 



Loxonema- hamiltonice. Hall. 



Pal. N. Y., Vol. V, pt. 2, p. 45, pi. 13. 



Specimens of this species are of about the usual size and appearance. 

 The species is abundant above the Encrinal at Livonia and occurs 

 all through the section at Cayuga Lake. 



