Rhynchonella corinthia. 

 Pleurotomaria sponsa. 



* Murchisonia simulatrix. 



* Mvircldsonia augustina. 

 *Maclurea crenulata. 



* Maclurea acuminata. 

 Ecculiomphalus superbus. 



* Orthoceras piscator. 



* Orthoceras allumettense. 



* Bathyurus nero. 

 Bathyuius breviceps. 

 AsaphuB huttoni. 

 Asaphus morrisii. 

 Asapbus quadraticaudatus. 

 Nileus macrops. 

 Nileua scrutator. 



* lUsenus fraternus. 

 *IU8enus conaimilis. 

 Endymionia meeki. 



MIDDLE AND UPPER ORDOVICIAN. 215 



Holometopus angelini. * 

 Harpides atlanticus. 

 Harpides concentricus. 

 Shumardia glacialis. 

 Cheirurus polydorus. 

 Cheirurus perforator. 

 Cheirurus sol. 



* Amphion barrandei. * 

 Triarthrus fischeri. 

 TelephuB americanus. 

 Encrinurus mirus. 

 Remopleurides panderi. 

 Remopleurides schlctheimi. 

 Ampyx Iseviusculua. 

 Ampyx normalis. 

 Ampyx rutilius. 

 Ampyx semicostatus. 



* Agnostus galba. 

 Agnostus 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 gray and white limestones 

 of division P at Cow Head. Camerella varians is a Chazy species. Orthoceras aUumettense is 

 both Chazy and Black River. Holometopus angelini, Endymionia meeTci, 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 Cheirurus, with a spine upon the glabella — 0. perforator. Another 

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

 bridge; and a third, C. satyrus, in the Chazy, at Montreal, by T. C. Weston, last year, 1864. 

 This type has been known for several years among the Russian trilobites by Sphmrexochus 

 cephaloceros (Nieskowski) = Zethus triplicatus (Eichwald), which occurs in the Pleta limestone. 

 The genus Triarthrus has not heretofore been found below the Trenton in America. Remo- 

 pleurides occurs in the Chazy, and Amphion in both Chazy and Calciferous; but neither of 

 these genera has yet been reported as occurring above the Chazy in Canada or New York. The 

 general aspect of the trilobitic fauna of this series of strata seems to me to be more Hke that of 

 the Pleta limestone of Russia and Angelin's two Swedish groups B C and C, than it is to that 

 of any of the American Lower Silurian formations heretofore illustrated. 



The second formation above mentioned consists of the 700 feet of black shales with gray 

 and white limestone conglomerates, at Cow Head. In no other part of Newfoundland do we 

 meet with the remarkable fauna which characterizes the Levis formation. It undoubtedly 

 occurs here in full force. The following hst contains the species collected at that locaHty, and 



also shows how many of them occur in Canada : 



c. H.. c. E. 



Stenopora fibrosa (Chazy to Devonian) X 



Graptolithus bryonoides X X 



Graptolithus denticulatus X X 



Graptolithus fruticosus X X 



Graptolithus headi X X 



Phyllograptus typus X X 



PtUograptus plumoeus X X 



Callograptua elegans X X 



Orthis hippolyte : X X 



* Camerella varians (Chazy) X 



Camerella calcifera (Calciferous) X X 



Camerella costata X X 



Lingula quebecensis X X 



Maclurea ponderosa .X X 



Ophileta bella X X 



Ecculiomphalus distans X 



Asaphus pelopa X X 



Bathyurus cordai (Calciferous).- X X 



Bathyurus conicus (Calciferous) X 



