VOL. V. 
K\NSAS CITY, MO., >[ A:i( ^M, 1891 
NO. 3 
KOU TlIK SCtK>TIST; 
Trilobites, 
Of Tin: Upper Coal Measure Group 
AT Kansas City, Mo. 
P>v Sip. J. Hare. 
From the Palaeozoic Kocks onlj' do 
we secure these imicU covet^^l fossils. 
They cnine into existence diiiiiio^ the 
TMCouie, or early CarabrMii Period, and 
^ucreas in nninbers until the (>aleifer- 
oti,«. or upper Taconic group ; tlien de- 
rreafse:! until ihe close of ilie Palteozoic 
time, v.iien they become extinct. 
In the St. John's group we tind the 
flr«t form of the Trilobite; from this 
group fifty species have l>een determine 
In the Potsdam group of tiu; lower 
Silurian seventy-two species have bfeu 
identified : the number , of specie's in- 
creased up to the close of the ('alcifer- 
ous Group, where ninty six are known 
to exist; from this time, they decrease 
in luunbers, as follows In the Niaga 
ra group of the Upper Siluriati. fifty 
sv)ecies : in the Upi)er Ilelderbergof the 
Devonian. forty-sev^'U species; in the 
Hamilton, whicli follows, twenty-seven 
species; six species, in the Keokuck 
Group of the Sid)-carboniferous; eleven 
species in the Coal Measure- ; an 1 rwo 
spicies in the Permian, where we find 
the last forms of this beautilul fossil. 
Of the order of Trilobites there have 
been described nearly six hiuidred 
species, belonging to slxty-niue genei a 
and twenty-four faunlies. 
Jn the ^'oul Measure Group there aie 
two genera. From th(! U|)per <'oal 
:Measure rocks of Kansas ('ity, three 
specie s have been identified, all of which 
belong to one genera; others niay be 
found when a thorough search of this 
locality has been made. 
The genus of tliis locality is the Phil- 
lipsin, to it belong the following species, 
Phill'psia m«j<n\ Phillipsia c/ijtonpii.si .s, 
and a new species, wliich is here first 
figured, and described; here also is an 
illustration ot Phillipsia iwtjor com))!* te, 
which has herett)fore generally be<Mi 
figured by the pygidiiun only, together 
with an illustration of tlu^ {>ygidiu li ot 
PhilUpsfa cliftonpnitis. 
I'HILLIPSlA KoDACOSTATUS. N. SP . 
{Nod<\ knotty ; costatns. ribbed. ; 
Plate, 1, Fig. 7 and 1 (a. b. c ) 
General t\;na, body eloiigaie-ovate. 
