Grabau — 



Faunas of the Hamilton Gkoup. 



289 



Genus Cystiphyllum, Lonsdale. 



157. Cystiphyllum americanum, E. and H. 



1851, Edwards and Haime, Polyp. Foss. Terr. Pal. p. 4<U, pi. 13. 



Tnis species is well represented in the coral layer of tlie lower Moscow 

 shales encrusted with bryozoa and other organisms. 



158. Cystiphyllum conifollis, Hall. 

 1876, Hall, Pal. N. Y., Ills. Dev. Foss, pi. 30. 



This is the most abundant species of Cystiphyllum in the Hamilton 

 group of this region. It occurs in the coral layer and other beds of the lower 

 Moscow shales, and also in the S. demissa bed of the Lower shales. 



Several other species of Cystiphyllum occur in the coral layer but they 

 are not in a satisfactory condition for identification. 



Genus Amplexus, Sowerby. 



159. Amplexus Hamiltonee, Hall. 

 1876, Hall, Pal. N. Y., Ills. Dev. Foss, pi. 19. 



This species is not infrequent in the lower Moscow shales, three to five 

 feet above the Encrinal limestone. 



160. Amplexus (?) intermittens, Hall. 

 1876, Hall, Pal. N. Y., Ills. Dev. Foss., pi. 32. 

 This species occurs sparingly in the beds three to five feet above the 

 Encrinal. It is a characteristic Moscow species, occurring in the lower part 

 of this shale at Morse creek, and other localities, but is probably not an 

 Amplexus. 



Genus Monotrypa, Nicholson. 

 161. Monotrypa feuticosa, Hall. 

 1876, Hall, Pal. N. Y., Ills. Dev. Foss., pi. 38. 

 This species occurs in the Moscow shales, three to five feet above the 

 Encrinal limestone, in the S. demissa bed and in the Pleurodictyum beds. It 

 is not a common species. 



Genus Aulopora, Goldfuss. 

 162. Aulopora serpens, Goldfuss. 

 1876, Rominger, Foss. Corals, p. 87. 

 This species occurs occasionally encrusting brachiopod shells. I have 

 found it in the 8. demissa bed and in the Athyris spinferoides bed. 



