152 



Annals of the Carnegie Museum. 



Aviculopecten cxacittus r. 

 A. princeps, c. 

 A. scabridus, r. 

 Gastropoda : 



P/ei/rotomaria capi/aria, r. 

 CycloJiema haviilto?ie)isis ? R. 

 Bcllerophon leda, r. 

 Platyceras biicciilentitm, r. 

 P. carinatiim, r. 

 P. sy/niiiefn'cit/ii, c. 



Cephalopoda : 



Orthoceras, sp. und. R. 

 Crustacea : 



Primetopsis punctilifcra / R. 



Kirkbya parallela, r. 



Strepula si^^moidalis, c. 



Isochi/ina liucata R. 



/. ? fabacea, R. 



Primita seminulmn r. 



Octonaria stigmata, r. 



Ctenobolina papulosa, r. 



Cypricardella bellistriata, r. 

 Cypricardinia indent a, R. 

 iV^iv/jj-rt; argiita ? R. 



Z'. ///^'//>, R. 



Diaphorostoma liueatitm, c. 

 Lflxonema delpJiicola, r. 

 Hyolithes acilis, r. 

 Tentaciilites belliilus, a. 

 Siyliola, sp. und. R. 



BeyricJiia kobnodini, c. 

 Haliella retifera, r. 

 Moore a bicorniita, R. 

 Pro'etus rowi, r. 

 Cyphaspis ornatus, R. 

 Dipleura dekayi, R. 

 PJiacops fana, c. 

 Cyprcvus boot hi, c. 



Discussion. 



For comparison of this faunule with the faunas of other Hamilton 

 outcrops, the species of the Thedford, Ont., Eighteen Mile Creek, 

 Livonia and Cayuga Lake sections were tabulated with the Canandai- 

 gua Lake species, as were also certain of those listed in Prosser's work 

 on the Hamilton of eastern New York. Li these lists only such fos- 

 sils were taken as were located by the various authors in some definite 

 stratigraphic horizon. On tabulating the species from various sections 

 in eastern New York, as represented by Prosser, it was found that 

 there was quite a change in the fauna of the upper part of the Ham- 

 ilton where the eastern boundary of Otsego county was passed, and 

 for that reason the fossils of Chenango and Otsego counties are grouped 

 together and those of Albany county put with those from Schoharie 

 county. None of the lists from the eastern part of the state are com- 

 plete and any conclusions drawn at this time are of course liable to 

 be upset when studies are made of carefully worked sections. In 



