380 The American Geologist. June, i89i 
Zacanthoides 4. Olenus 1, Strcnuclla 2 including Agnostics stremius 
and Anomocare .' parvum). 
The CAMBRIC or Lower Silurian is represented by the follow- 
ing genera: Acidaspis 9, Agnostus 3, Agraulos 1, Araphion 8, Ampyx 6, 
Asaphus 27, Barrandia 1, Bathyurellus 9, Bathyurus 17 (?) Bronteus 
1. Calymene 7, Ceraurus 18, Chasmops 1, Dalmanites 7, Dionide 1, 
Encrinurus 5, Endymionia 1, Harpes 6, Holometopus 1, Homalonotus 
1 Harpides 3, Illaenus 25, Lichas 6, Megalaspis 2, Nileus 3, Ogygia 2, 
Panderia 1, Proetus 2, Remopleurides 5, Sao 1, Sphaerexoehus 1, 
Sphasrocoryphe 2, Symphysurus 1, Telephus 1, Triarthrus 5, Trinu- 
cleus 2. 
SILURIC or Upper Silurian, Acidaspis 5, Bronteus 8, Calymene 8, 
Dalmanites 17, Cyphaspis 3, Encrinurus 8, Homalonotus 3, Illaenus 14, 
Lichas 12, Phacops 6, Proetus 7, Sphaerexoehus 3, Ceraurus :.'. 
DEVONIC, Acidaspis 2, Bronteus 2, Cyphaspis 8, Cryphseus 4, 
Dalmanites 17, Homalonotus 4, Lichas 7, Phacops 6, Proetus 28, Phae- 
thonides 4. 
CARBONIC, Phillipsia 14, Phaethonides 4, Grifflthides 6, 
Proetus 9, Bathymetopus 1, Dalmanites (?) 1. 
PERMIAN, Phillipsia 1. 
The non-trilobitic genera and species are catalogued in the third part 
of the work. The author gives a systematic classification of the genera 
and catalogues 275 species under 65 genera as follows : 
TACONIC, Protocaris 1, Leperditia 2, Aristozoe 2, Nothozoe 1, 
Beyrichona 2, Hipponicharion 1, Lepidilla 1, Lepiditta 2. 
CAMBRIC or Lower Silurian, ^Echmina 1, Aparchites 2, Beyrichia 
18, Bythocypris 3, (Cytherc 1 ?) (Cytherina 3 ?) (Cytheropsis 1 ?) Echi- 
nognathus 1, Entomis 1, Eurychilina 3, Isochilina 7, Leperditia 21, 
Lepidocoleus 1, Primitia 4, Strepula 2, Bollia 1. 
SILURIC or Upper Silurian, .Echmlna 1, Bairdia 1, Beyrichia 16, 
Bollia 2, Bythocypris 1, Ceratiocaris 6, Dolichopterus 1, Eurypte- 
rus 11. Kloedinia 2, Leperditia 15, Pterygotus 10, Macrocypris 1, 
Polycope 1, Bunodella 1, Primitia 2. 
DEVONIC; Amphipeltis 1, Beyrichia 8, Bollia 4, Bythocypris 1, Cera- 
tiocaris 3, Dipterocaris 3, Dithyrocaris 1, Echinocaris 7, Elymocaris 
2, Entomis 2, Estherki 1, Eurypterus 1,'lsochillna 2, Kloedinia 1, Leper- 
ditia 4, Lisgocaris 1, Moorea 1, Mesothyra 3, Octonaria 1, Palasopala?- 
mon 1, Palasoereusia 1, Plumulites 2, Protolemulus 1, Primitia 4, Primi- 
topsis 1, Protobalanus 1, Rhinocaris 2, Schizodiscus 1, Spathiocaris 1, 
Strobelepsis 1, Stylonurus 2, Strepula 2, Tropidocaris 4. Turrilepas 8, 
Ulrichia 1, Eurypterella 1. 
CARBONIC. AcanthOtelson 2, Anthrapalaemon 2, Archaeocaris 
1, Ceratiocaris 2, Cryptozoe 1, Cyclus 1, Cythere ? (5, Cytherellina 1, 
Dipeltis 1, Diplostylus 1, Dithyrocaris 1, Estheria 1, Eurypterus 5, 
Isochilina 1, Leaia 2. Leperditia 2, Palaeocaris 1, Prestwichia 1. Ra- 
chura 1, Strigocaris 2, Belinurus 1, Beyrichia 3 Carbonia 3. (See note.) 
In the supplement the genera Olenoides, Dorypyge and Angelin's 
Corynexoehus in part are placed as synonyms of Atops of Emmons, the 
authority for this being Ford's figure of Atops trilineatus from Troy, 
N. Y. 
