Tropidolepius Fauna at Cananijaigua Lake, N. \. 165 



Amboctvlia iiinhonata Conrad. 



Pal. N. Y., Vol. IV, 1S67, ]). 259, ])]. 44. 



While young individuals of this species were not uncommon, only 

 three or four adults were found, and they were all of small size. The 

 species is common from Thedford to Albany Co. 



Nucleospira concinna Hall. 



Pal. N. Y., Vol. IV, p. 867, p. 279, pi. 45. 



This species is rare in this faunule, rare in the upper Hamilton at 

 Thedford and Livonia, and found all through the sections at Eighteen 

 Mile Creek and Cayuga Lake, though it occurred in only a few zones 

 and was rare except for a short distance below the Encrinal at Eigh- 

 teen Mile Creek. It is not reported from eastern New York. 



Athytis spiriferoides Eaton. 



Pal. N. Y., Vol. IV, 1867, p. 285, pi. 46. 



This shell common and of large size, although few of the specimens 

 were silicified. The species is common in all sections. 



Pholidops oblata Hall. 



Pal. N. Y., Vol. IV, 1867, p. 414, pi. 3, fig. 10. 



Of the sections here used for the comparisons, only two, Eighteen 

 Mile Creek and Cayuga Lake, have furnished specimens of this fossil, 

 and in both localities it is confined to the Encrinal limestone, where 

 it is found but rarely. In the present locality it is common, over 200 

 specimens having been obtained. 



P. ]iainilto7ii(B Hall. 



Pal. X..Y., Vol. IV, 1867, p. 32, pi. 3, figs. 6-7. 



This is one of the most abundant fossils in the faunule, as there are 

 about 1,500 specimens in the collection. According to Cleland, the 

 vertical range of this species is about the same in the Eighteen Mile 

 Creek, Livonia and Cayuga Lake sections, and the center of abun- 

 dance in the upper part of the Lower Hamilton. The largest speci- 

 men in this collection is 3.9 mm. long and 3.2 mm. wide, practically 

 the dimensions of the largest specimen from Cayuga Lake. The shell 

 has been found in the Upper Hamilton at Thedford, but has not yet 

 been reported from the eastern counties. 



Crania cre7iistriata Hall. 



Pal. X. Y., Vol. IV, 1867, 1)1. 3, figs. 1-16. 



This species is not common. The largest specimen is 12.5 mm. 

 long and 13.5 mm. wide. The fossil is found rarely in the upper 



