222 J. Hal’ on the Primordial Fauna, 
The Crustacean fauna of the primordial zone of Europe. 
Paradoxides, - 
Olenus, ee 
Conocephalus. % se genera are all limited to the fauna primordiale, and 
“ae P pane none of the other Fae 2ire genera of trilobites are 
Saeed known in this faun 
= ld eat 
Arionellus, - = - 
gnost ~ Of the first and second fa 
Amphion, -— - Placed with doubt in the “frst fauna, and is well developed 
in the second fauna. 
The Crustacean fauna of the Quebec Group. 
Y, 
sae ten nes : t Genera of the primordial zone. 
Agnostus, - < A genus passing from the first to the second fauna. 
ra } Genera of the Potsdam period. 
Bathyu - Quebec group. 
Asaphus, - Of the second fa’ 
llleenus, - - Of the second and third fau 
Amphion, - - Of the Ie second fauna; and doubtfally of the first fauna in 
' 
Sw 
Ceraurus = Chierurus, Of the — and third Silurian faune, and of the Devo- 
We have therefore in the Quebec Group, two established 
genera of the primordial zone; one, Agnostus, which passes 
cond; and three,—Asaphus, Illenus and Chierurus, which begin 
their existence in the second fauna. Of these, Asaphus begins and 
ends in the second; Illsnus begins with om second and continues 
to the third; while Ceraurus = Chieru us begins in the second, 
ie through the third Silurian, and appears in the Devonian 
Bathyurus is a ty er and as yet has no stratigraphical 
ae in comparis ‘Those - whic I described as Olenus 
The gen eeu Ditetncaphotus ai Monecipha are of the Pots 
dam group; and so far the ee group is in parallelism m with 
the Potad ait and Calcifero 
Of the other genera, we aw, Acaphns, Illeenus and Ceraurus 
= Chierurus) in the Trenton and Hudson River 
groups; Illszenus and Ceraurus i in ae 0 Seopa me ne are 
Niagara age, or the third fauna of Barrande ; e Cel 
_* Not Elliptocephalus of Hautes ie. of 
Thirteenth Annual Report of the Regents of the University of N, Yo" 
State Oabinet of Natural History, Albany, December, 1860. 
