ORISKANY FAUNA OF BECRAFT MOUNTAIN 101 



pass over into later faunas. No additional evidence is required to 

 establish the individuality of the fauna of the Manlius limestone and its 

 affiliation with the Siluric. As the names of several species appear on 

 Prof. Williams's list which belong to the Helderbergian, I feel it necessary 

 to add that of the following I have found no trace : Lingula recti- 

 latera, Orthostrophia strop homenoides v Nucleospira 

 ventricosa, Holopea danai. 1 



1 Dr Grabau's study of the organic remains of the Manlius limestone of 

 Erie county (op. cit.) which was to some extent based on collections from this 

 horizon in the N. Y. state museum have resulted in the identification of a considerable 

 number of species. As this work has issued since the foregoing matter was in 

 type his results are briefly presented. Following are the species: 



Nematophytum eras sum Penhallow 



Cyathophyllum hydraulicum Simpson (MSS.). This species is every- 

 where abundant throughout the western extent of the Manlius waterlimes. 



Orthothetes hyd raulica Whitfield. Originally described from Bellville 

 and Greenfield O. 



Spirifer eriensis Graban. This species has commonly passed under 

 the name of S. vanuxemi which, as noted by Whitfield and others, is hardly 

 distinguishable from S. crispu as it occurs in the Coralline limestone at 

 Schoharie. 



Whitfieldella sulcata Vanuxem 



Whitfieldella cf. rotundata Whitfield 



Whitfieldella cf. laevis Whitfield 



Loxonema ? sp. 



Pleurotomaria ? sp. 



Trochoceras gebhardi Hall 



Leperditia scalaris Jones 



The most striking feature of this little fauna is its similarity to that of the 

 Coralline limestone of eastern New York, the representative of the Niagaran 

 formation in that region. This is seen in the similarity of Spirifer eriensis 

 to the S. crispns as identified by Hall from that formation, of Whit- 

 fieldella cf. rotundata with W. nucleolata of the same formation. 

 The presence of Trochoceras gebhardi in both and the close relationship 

 of Leperditia scalaris Jones with L. jonesi Hall of the Coralline 

 limestone. Dr Grabau's conclusion from the study of this fauna as well as of 

 the tectonic relations of the strata in Erie county emphasizes the strongly Siluric 

 character of the Manlius limestone. 



