INTRODUCTION. 



xix 



Pro, tus Haldt mani. 

 Proit us macroceplialus. 



/'>■<; I n'S Hnlli. 



Pro, ttis jtjumts. 



* Proilus Phocion. 



* Pro,! its Prouti. 

 /', etus .\> vadCB. 



' PrOl his nr, 'i,l, us. 



Proitv ■ ')l igh audits. 

 Phaithonides gt mmceus. 

 * Phaithonides (?) ,1, nticulatus. 

 i "yphaspis ornata. 

 Oyphaspis ornata, var. baeeata. 

 i 'ypJiaspis , raspedota. 



Of this list those bearing a, star (*) arc from localities outside the State of New- 

 York, which may be regarded as of the age of the Hamilton group. 

 Of the Phyllocarida, are : 



EcMnocaris punctata. 

 Elymocaris capsella. 

 Tropidocaris Bumiltonice. 

 MesotJiyra Neptuni. 



Of the Piivllopoda, the species : 



Estht Ha pulex. 

 Of the Cirripedia : 



Strobilepis spinigera. 

 Turrilepas I>, nmi, as. 

 Turrilepas squama. 



Mesothyra spuincBa. 

 | Bithyrocaris) Belli. 



Hli'iiinniris ml iimhimi. 

 BMnocaris scaph 



Schizodiscus capsa. 



Turrilepas nitidulus. 

 Turrilepas foliatus. 

 Turrilepas !• «< r. 



Of these forty species, twenty-nine occur within the limits of this State. 



Tally limestone. 

 Trilobitic remains only have been found in this formation, and these are, with 

 one exception, the more common species of the underlying shales. 



Brunt, us TuU'iiis. 



Phacops rii mi. 



Dalmanites (Oryphmus) Boothi. 



Dalmanites (Cryphceus) Boothi, var. CaUiteles. 

 Pro, his Rowi. 



ProettiS ninrruii plml ns. 



Genesee shales. 

 These bituminous beds have produced but a single Crustacean, Ceratiocaris 

 longicauda. 



Portage group. 

 Under this designation, as used in this work, are included all the shales and 

 sandstones lying between the Genesee shales below and the lowest sandstones 

 bearing a typical Chemung fauna. These beds and their equivalents in other 



