Lower Heldeebeeg Fauna. 305 



detect the presence of either mural pores or septa. It is, therefore, 

 impossible to retain these forms in the genus Favosites. On the 

 other hand, the small size of the cells, the superimposed mode of 

 growth, and, in the case of ChcBtetes spherictcs^ the presence of 

 maculae, all indicate an affinity with the Bryozoa. 



Alveolites, Lamarck, 1801. 



Alveolites explanatus, Hall, 1884. 



Alveolites explanatus, Hall, 1884. Rep. State Geologist for 1883, expl. PI. 13, 

 figs. 15, 16. 



Alveolites explanatus, Hall, 1887. Pal. New York, vol. VI, p. 11. 



Formation. — Lower Pentamerus limestone. 



Localities.— Cedarville, Clarksville and Schoharie, N. Y. 



Pleurodictyum, Goldfuss, 1826. 



Pleurodictyum lenticulare, Hall, 1874. 



Michelinia lenticularis, Hall, 1874. Twenty-sixth Rep. New York State Mus. 

 Nat. Hist., p. 113. 



Michelinia lenticularis, Hall, 1879. Thirty- second Rep. New York State Mus. 

 Nat. Hist., p. 145. 



Michelinia lenticularis, Hall, 1883. Rep. State Geologist for 1882, expl. PI. 

 m, figs. 1, 2, 3, 5. 



Pleurodictyum lenticulare, Beecher, 1891. Trans. Connecticut Acad., vol. 

 VHI, p. 207. 



i^orma^ion. — Shaly limestone, Albany county, N. Y. 



Striatopora, Hall, 1852. 

 Striatopora Issa, Hall, 1874. 



Striatopora Issa, Hall, 1874. Twenty-sixth Rep. New York State Mus. Nat. 

 Hist., p. 114. 



Striatopora Issa, Hall, 1879. Thirty-second Rep. New York State Mus. Nat. 

 Hist., p. 144. 



Striatopora Issa, Hall, 1883. Rep. of State Geologist for 1882, expl. PI. Ill, 

 figs. 14, 15. 



Striatopora Issa, Hall, 1887. Pal. New York, vol. VI, p. 6. 



Formation and locality.— Shalj limestone, Helderberg mountains, Albany 

 county, and Becraf t's mountain, Columbia county, N. Y . 

 39 



