378 



AXXALS OF THE CaRNRGIK MusEU.M. 



Most of the genera found in the Trenton are represented in the 

 Chazy by species similar to those in the upper formation, but a few, 

 Trinuclcits, Cyphaspis, Ni/ciis, Brouteiis, Broiii:;/iiartia, Calyniene and 

 Encriniints have not yet l)een found lower than the Black River. 

 The close relationship of the Chazy and Trenton trilobite faunas is 

 em})hasized by the followinir table, which shows that there are three 

 species common to the two formations and nineteen more which are 

 represented in the Trenton by closely allied species. The names 

 printed in smai.i, capitals are those of sjiecies which are \ery closely 

 allied. 



Chazy species. 



Haki'INA ottawaknsis, 

 Lo)ichodoi>ias halli, 

 Rrmiplf.uridks canadensis, 



BaTHYURUS ANCKI.IM, 



Jsoteliis harrisi, ) 

 Tsoteltts obtiiitis, \ 



ILL^NCS INDETERMINAI CS, 



Ilhenns piincta/iis, i 

 Jllteniis bavfieliH, ' 

 Illanus globosiis, 1 

 IlUcmis ems til si, \ 

 Thalf.oi'S ovatus 



i'latymetorus m incanen.sis, 



Proetls CI.ELANDI, 



Glaphuriis piisfiilatiis, ] 

 Glaphurus primus, ) 



CVBEI.E VALCOURFNSIS, 

 Ceratiriis pompilius 

 Ceraurus hudsoni, 



STH.IiROCORPHE (lOODNOVr, 



Pseudosph.erexochus VULCANUS, 

 Pterygometopus axnulatus, 



1 rentoii species. 



H AR PI NA ottawaknsis, 



Lonchodontas liaslatus, 



REMIPLEURIDES 1 INGUATUS, 



Bathyurus extans, 

 ( Fsotelus maxim us, 

 ( Isotelus gigas, 



IlF.KNUS INDETERMINA IT'S, 



///, 



iDius ameiuanus 



Btniia^tiis irailouensis, 

 ThAI.EOI'S ON'ATCS, 



Platymetopus tr entonensis, 

 pl.a! ymetopus cucullcs, 



( PrOETUS PARVirsCL'LUS, 



( Proelus latiiiiaigiitatus, 



( Odontopleun; paruhi, 



\ Odonlopleura Ireutonensis, 



Cykele WINCHEI.LI, 



(. eraurtts scofieldi, 



Ceracrus pleurexanthemfs, 

 ( Sph.eroc'irphe robustus, 

 \ Sph/rrocorphe major, 



pseudosph.-krexoc hustrentonensis, 

 Pterygometopus cai.mckphaffs. 



When the trilobites of the Chazy are compared with those of the 

 Calciferous considerably less agreement is found. The genus Batliyunis, 

 which is so abundantly developed in the lower beds, is represented by 

 only one species, and that one is not found in the region of the typi- 

 cal Chazy fauna. As has already been pointed out, Asaphus canalis of 

 the Fort Cassin fauna has a representative in Isotelus harrisi of the 



