INTRODUCTION. 
XIX 
Proitus Haldemani. 
Proetus macrocepJ/ahcs. 
Proetns Powi. 
Proetus jejunus. 
* Proetus Phocion. 
* Proetus Prouti. 
* Proetus Nevada}. 
* Proettos occidens. 
* Proetus (?)lovgicaudus. 
Phaetlwnides geiminmus. 
* PTiaethonides (?) devticulatus. 
Cyphaspis ornata. 
Cyphaspis ornata, vai-. baccata. 
Cypliasp)is craspedota. 
Of this list those bearing a star (*) are from localities outside the State of New 
York, which may be regarded as of the age of the Hamilton group. 
Of the Phyllocarida, are; 
Echinocaris punctata. 
Elymocaris capsella. 
Tropidocaris Hamiltomw. 
Mesothyra Neptuni. 
Of the Phyllopoda, the species: 
Estheria pulex. 
Of the CiRRiPEDiA; 
Mesothyra .spumcea. 
{Bithyrocaris) Belli. 
Rhbiocaris columbina. 
Mhinocaris scaphoptera. 
/Schizodlscjis capsa. 
Strobilepis .splnigera. 
Turrilepas Bevonicns. 
Tarrilepas .squama. 
Tumlepas nitididus. 
Turrilepas foliatus. 
Turrilepas tener. 
Of these forty species, twenty-nine occur within the limits of this State. 
Tully limestone. 
Trilobitic remains only have been found in this formation, and these are, with 
one exception, the more common species of the underlying shales. 
Brontens Tullius. Balmanites {CryphcBus) Boothi, var. Calliteles. 
Phacops rana. Proetus Rowi. 
Balmanites {Cryphmis) Boothi. Proetus macrocephalus. 
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 
