102 



Report of the State Geologist. 



Distribution. Iu certain of the above references the species Gon. corn- 

 planatus or Clymenia Erato is cited as occurring in the Hamilton shales. 

 Thus, of the figures given in Palaeontology of New York, vol. v, pt. 2, that on 

 pi. lxx, figure 6, is stated to be from just below the Genesee shales on Fall 

 creek, Geneseo, Livingston county; figure 7, the original specimen of Clymenia 

 Erato, from Moscow, Genesee county. Also, in the Supplement to this 

 volume, published in 1888 (see citation) a figure is given of a septiferous 

 shell from the Hamilton group at Geneseo. Though this is a broadly umbili- 

 cated shell, it is evidently not closely related to Probel. Lutheri, as shown by 

 its general form and septation. The other specimens from the Hamilton 

 group afford no clew to the internal structure and it is less likely that they 

 represent Prob. Lutheri than the distinct though imperfectly known form 

 just specified. 



A shade of doubt is cast over all these citations from the facts that these 

 localities are so situated that any of them could furnish specimens from either 

 the Hamilton or Portage formations, and also, because no specimen of this 

 type has been recorded from the Hamilton group where doubts could not 

 fairly arise as to the authenticity of the record, nor has any such been 

 observed by the writer in all the extensive collections from this formation 

 that have come under his examination. 



Genesee shales. In its normal adult condition, the species has not been 

 observed in these beds. We have already noticed that the Styliola limestone 

 contains a small shell corresponding throughout to an immature stage of 

 Probel. Lutht-ri, but, so far as our knowledge extends, this shell {Gefphyroceras 

 Genundewd) does not pass this phyloneanic condition. Still, more complete 

 information may demonstrate that these are the actual young of Probel. 

 Lutheri (see page 86). 



Portage shales and flag*. Especially abundant in the soft shales at 

 Naples, Ontario county, along the Cashaqua creek, Livingston county; less 

 common in the Genesee valley section, though not infrequent further west in 

 Erie county. Fine barite replacements have been obtained from the concre- 

 tions in the region of Honeoye and Conesus lakes. 



Genus Beloceras, Hyatt. 



This genus was based upon the Westphalian Devonian species, Gon. 

 multiloba/ us, Beyrich ( Gon. sa(/itfa ri us, Sandberger), a discoidal, laterally 

 compressed shell, with broad, peripherally flattened whorls, rather narrowly 



