374 



latter locality appear to lie above the 700 feet of sandstone constituting 

 Division 0, and are, therefore, in the foregoing descriptions of species, 

 referred to Division P. Taking these three localities to be on the same, 

 or nearly the same, horizon, we have from them, in addition to a few not 

 yet described, the following 48 species : 



Lingula Nympha Nileus macrops 



lole " scrutator 



" Gyane * Illaenus fraternus 



Acrotreta gemma * " consimilis 



Orthis delicatula Endymionia Meeki 



* Strophomena Aurora Holometopus Angelini * 



" imbecilis Harpides Atlanticus 



" decipiens (?) " concentricus 



Camerella parva Shumardia glacialis 



" varians * Cheirurus Polydorus 



Rhynchonella Corinthia " perforator 



Pleurotomaria sponsa " Sol 



* Murchisonia simulatrix * Amphion Barrandei * 



* " Augustina Triarthrus Fischer! 



* Maclurea crenulata Telephus Americanus 



* " acuminata Encrinurus mirus 

 Eceuliomphalus superbus Remopleurides Panderi 



* Orthoceras piseator " Schlotheimi 



* Allumettense Ampyx laeviusculus 



* Bathyurus Nero " normalis 



" breviceps " Rutilius 



Asaphus Huttoni " semicostatus 



Morrisii * Agnostus galba 



" quadraticaudatus " Fabius 



In the above list those with an asterisk before them are found in some 

 one or more of the Divisions below N ; those with an asterisk after them 

 occur in the grey and white limestones of Division P, at Cow Head. 

 Camerella varians is a Chazy species. Orthoceras Allumettense is both 

 Chazy and Black River. Holometopus Angelini, Endymionia Meeki, and 

 Cheirurus Sol occur in the Quebec group of Canada East. We find here, 

 for the first time, among American trilobites the peculiar type of Cheiru- 

 rus, with a spine upon the glabella C. perforator (ante, p. 287). Another 

 of the same structure, C. glaucus, was discovered in the Quebec group, 

 in the township of Stanbridge ; and a third, C. Satyrus, in the Chazy, at 

 Montreal, by T. C. Weston, last year, 1864 (ante, p. 323). This type 

 has been known for several years among the Russian trilobites by Sphce- 

 rexochus cephaloceros (Nieskowski) = Zethus triplicatus (Eichwald), 

 which occurs in the Pleta limestone. The genus Triarthrus has not 

 heretofore been found below the Trenton in America. Remopleurides 

 occurs in the Chazy, and Amphion in both Chazy and Calciferous ; but 



