280 



Report op the State Geologist. 



Athyris spiriferoides nine feet below the Encrinal limestone, but is rare. A 

 single specimen from the limestone is referred to this species with some 

 doubt. The species is again sparingly represented in the lower Moscow 

 shales, three to five feet above the Encrinal limestone. 



Genus Athyris, McCoy. 



121. Athyris spiriferoides, Eaton. 



1867, Hall, Pal. N. Y., vol. 4, p. 285, pi. 46. 



This is one of the characteristic fossils of the Hamilton group of this 

 region. It is abundant, however, only at a few levels. The layer most pro- 

 lific in specimens is about nine feet below the Encrinal limestone (Athyris 

 spiriferoides layer). The specimens in this layer are usually well preserved 

 owing to the presence in considerable number of calcareous concretions, some 

 of which are filled with this brachiopod. In the shale between the lower and 

 middle Trilobite layers the species is likewise abundant. It occurs sparingly 

 in the shale between these two levels, with the exception of a calcareous bed 

 twenty feet below the Encrinal limestone where it is well represented. Below 

 the Trilobite beds it is not uncommon down to the Nautilus bed, below which 

 it has not been observed. Above the Athyris bed, it is well represented in 

 the remaining portion of the Hamilton shales. It is not an uncommon form 

 in the Encrinal limestone, and it is fairly well represented in the lower five 

 feet of the Moscow shale. Several impressions were found in the upper 

 Moscow shales, about two feet below the Styliola band. 



Genus Meristella, Hall. 



122. Meristella Haskinsi, Hall. 



1867, Hall, Pal. N. Y., vol. 4, p. 306, pi. 49. 



A few specimens mainly small, and all exfoliated, are referred to this 

 species. They are from the Encrinal limestone. 



123. Meristella rostrata, Hall. 



1867, Hall, Pal. N. Y., vol. 4, p. 307, pi. 50. 



Among the collections from the Encrinal limestone are two small 

 specimens of this species, both of the ordinary size, but differing in shape. 

 One shows radiating striae, and corresponds to fig. 17, pi. 50, while the other is 

 more like figs. 15 to 18, pi. 63 (Pal. N. Y. vol. 4), though smaller. 



