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, Ave have from them, in addition to a few not 

 yet described, the following 48 species : — 



Lingula Nympha 



" lole 



" Cyane 

 Acrotreta gemma 

 Orthis delicatula 



• Strophomena Aurora 



" imbecilis 



" decipieng (?) 



Camerella parva 



" Tarians * 

 Rhynchonella Corinthia 

 Pleurotomaria sponsa 



• Murcbisouia simulatrix 



• " Augustina 



• Maclurea crenulata 



• *' acuminata 

 Ecculiomphalus superbua 



• Orthoceras piscator 



• " Allumettense 



• Bathyurus Nero 



" breyiceps 



Asaphus Huttoni 

 " Morrisii 

 " quadraticaudatua 



Nileus macrops 

 " scrutator 

 • Illsnus fraternus 

 ' " consimilis 

 Endymionia Meeki 

 Holometopus Angelini • 

 Harpides Atlanticus 



" concentricus 

 Sbumardia glacialis 

 Cheirurus Polydorus 

 " perforator 



" Sol 



Ampbion Barrandei ' 

 Triarthrus Fiscberi 

 Telepbus Americanus 

 Encrinurus mirus 

 Remopleurides Panderi 



" Scblotbeimi 



Ampyx IfCTiusculus 

 " normalis 

 " Rutilius 

 " semicostatus 

 Agnostus galba 

 " Fabius 



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

 one or more of the Divisions l3elow 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, Undymionia Sleeki, and 

 Oheirunis 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 Sphoe- 

 rexochus ce2?haloceros (Nieskowski) = ^e^fes 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 



