INTRODUCTION. 
xii 
Models of the Species,” by Jacob Green, M. D., accompanied by a Supplement 
in 1835. This Monograph included several of the best known and most char¬ 
acteristic of the Devonian species, namely: 
Calymene 2 }lati/s. Amphus (— Dalmanites) pleuropti/x. 
Dipleura (Hovialoiiotus) Dekayi. A. (= D.) niyrmecophorus. 
Calymene {— Phacops) bvfo. Calymene (= D.) anchiops. 
C. bufo, ^’a^. ra7ia — Phacops rana. Calymene'^ Odontocephala = D. selenwrus. 
In the Annual Reports of the Palaeontological Department of the New York 
State Geological Survey, for 1839, 1840 and 1841, Mr. T. A. Conrad described 
the species Odontocephalus selenurus (Eaton), Asaphus (= Dalmanites) aspectans, 
Cahjmene marginalis {= Proetus Rowi, Green, 1838), Asaphus? denticulatus (= Dal- 
manites aspectans), and Asaphus? acantholeurus Dalmanites myrmecophorus. Green). 
From this date onward to the year 1861, brief notices of American Devonian 
Trilobites were published by various writers, viz.; 
Burmeister, Emmons, Owen, Vanuxem. 
Castelnau, Hall, Shumard, 
In 1861, Professor James Hall published (Descriptions of New Species of Fossils 
from the Upper Helderberg, Hamilton and Chemung groups; in advance sheets 
of the Fifteenth Annual Report of the New York State Cabinet of Natural 
History) a brief revision of the previously described Devonian Trilobites from 
the State of New York, with the addition of several new species. The follow¬ 
ing species were discussed: 
Calymene platys, Green. 
Homalouotus Dekayi, Green. 
Phacops cristaia, Hall. 
Phacops bomhifimis, Hall (= Ph. cristata, partim). 
Phacops rana, Green. 
Phacops bufo. Green. 
Phacops Cacapona, Hall. 
Phacops mcpcra. Hall (1843). 
Dalmania Helena, Hall (= Dalmanites) aspectans, 
Conrad. 
Dalmania (= Dalmanites) myrmecophonis, Green. 
Dalmania (= Dalmanites) emarginata. Hall. 
Dalmania (= Dalmanites) Pleione, Hall. 
Dalmania (= Dalmanites) Boothii, Green. 
Dalmania (= Dalmanites) seleniums, Eaton. 
Dalmania (= Dalmanites) bifida. Hall. 
Dalmania {= Dalmanites) JEgei'ia, Hall. 
Dalmania (= Dalmanites) coronata. Hall. 
Dalmania (= Dalmanites) anchiops. Green. 
Dalmania{=Dalmanites)anchiops,'vr.armata,CLx-Li. 
Dalmania (== Dalmanites) Calypso, Hall. 
Dalmania (= Dalmanites) Erina, Hall. 
Dalmania (= Dalmanites) macrops. Hall. 
Lichas granclis. Hall. 
Lichas armatus. Hall (= L. Eriopis, Hall). 
Proetus Conradi, Hall. 
Proetus angustifrons. Hall. 
Proetus Hesione, Hall. 
Proetus crassimargwiatus. Hall. 
Proetus clarus. Hall. 
Proetus canalicfulatus. Hall. 
Proetus Verneuili, Hall. 
Proetus Haldemani, Hall. 
Proetus macrocephalus. Hall. 
Proetus marginalis, Conrad. 
Proetus Rowii, Green. 
Proetus longicaudus. Hall. 
Proetus occidens. Hall. 
