Prosser — Hamilton and Chemung Series. 



135 



1. Spirifer mesast/rialis, Hall. (c) 



Several specimens of the exterior clearly show the striae, so there 

 can be no doubt as to the species. 



2. Spirifer mucronatus, Hall. (c) 



These specimens are small and mucronate with few plications. 

 In the interior of one is a small septum showing the beginning 

 of that character. These are like many of the Ithaca speci- 

 mens, and probably it would be better to call them varieties of 

 this species. 



3. Spirifer granulosus (Con.), Hall and Clarke, (it) 



Two external impressions which have distinct pits that must 

 have been made by pustules, and the impression of the dorsal 

 valve shows a small furrow along the center of the fold. 



4. Oyrtina Hdmiltonensis, H. (?). (it) 



Broken and poorly preserved specimen. 



5. Ohonetes scifula*, H. (a) 



6. Ohonetes setigera, Hall. (c) 



Smaller specimens with fewer and coarser striae having form of 

 this species and spines at the same angle from the hinge line. 



7. Rhynchondla (Camarotcechid) Stevensi, Hall, (c) 



Two or three specimens approach the Ii. (6 y .) exirnia type. 



8. Tropidohptux mrinatus (Con.), Hall. (r) 

 !>. Atrypa reticularis (Lin.), Dalm. (r) 



10. Si/ropkeodonta perplana (Con.), Hall (?). (it) 



Poorly preserved. 



11. Orthis, sp. (rr) 



Not poorly preserved but apparently nearer in form to 

 0. Vanuxenvi, II., than to 0. irnpressa, H. 



12. 



Paht'onnlo onarginata (Con.), Hall. 



(rr) 



13. 



Modiomorpha rwyUloides (Con.), Hall. 



(rr) 



14. 



Modiomorpha concentrica (Con.), Hall. 



(rr) 



15. 



Paracyclas lir<it<i (Con.), Hall. 



(rr) 



16. 



Palceoneilo constricta (Con.), Hall. 



(rr) 



From the above fauna this ledge is referred to the Ithaca formation, but 

 it is probably fully 100 feet above its base. The approximate altitude of the 

 ledge is 1,686 feet A. T., and the altitude of the lowest Ithaca fossils on the top 

 of the hill above the Swan quarry is 1,544 feet. This locality is two miles 



