107 



Ccdymene JViagarensis, Hall , 1843. Geol. Rep. 4th Distr. N 



York, p. 102, and fig. 3 on p. 101. 



CcUymene Blumenbachii vsjV. JViagarensis, Hall. .1852. Pal. N. York, vol. II., p. 



307, pi. 67, figs. 11 and 12. 



Calymene Blumenbachii, Billings 1863. Geol. Canada, p. 340. 



Oalymene Niagarensis, Hall 1867. Twentieth Rep. Reg. N. 



York St. Cab. Nat. Hist., p. 334. 



On one of the tablets in the Museum of the Survey there are three im- 

 perfect and badly preserved specimens of a trilobite collected at Gait, two 

 by A. Murray in 1847, and one by E. Billings in 1857, which were label 

 led with, the name of this species by E. Billings, many years ago. These 

 are evidently the specimens of C. Blumenbachii referred to on page 340 of 

 the Geology of Canada. Two of them are coarse casts of the interior of 

 the head and thorax, and one a similar cast of the thorax and pygidium. 



Mr. Billings was of the opinion that C. senaria, Conrad, C. Niagarensis, 

 Hall, and C. platys, Green, are synonymous with C. Blumenbachii, but 

 Salter, in his Monograph of the British Trilobites, retains C. senaria as a 

 distinct subspecies, although he places C. Niagarensis, Hall, among the 

 synonyms of C. Blumenbachii. Exclusive of the trilobites from the 

 Trenton and Hud.son River formations which are generplly referred to C. 

 senaria, there are in the Museum of the Survey, specimens labelled C. 

 Blumenbachii by E. Billings, from the Niagara limestsne at Limehouse, 

 Ontario ; from the Anticosti group at six diflferent localities on the island 

 of Anticosti ; from the Lower Helderberg rocks at Cap Bon Ami, near 

 Dalhousie, New Brunswick ; and from the Silurian (Upper Silurian) rocks 

 at Arisaig, Nova Scotia. In the "Geology of Canada" (1863), C. 

 Blumenbachii is recorded as occurring also in the Clinton formation at 

 Flamborough West, near Dundas, Ontario ; in the Niagara limestone at 

 Thorold and Elamborough West ; and in the limestones of the Anticosti 

 Group at the Chatte River in the province of Quebec. 



According to Lindstrom* this species was first described by Brunn in 

 1781 under the name Trilobites tuberculatus, and hence should be called 

 Calymmene tuberculata (Brunn), as it is by Friedrich Schmidt t and some 

 other recent writers upon European palaeontology. 



Ceraurus Niagarensis. Hall. 



Cerattmsm.«j7)m- (Beyrich) Hall., 1852. Pal. N. York, vol. II., pp. 300 and .306, 



pis. 66. fig. 4, and 67, figs. 9 and 10. 



*Ofversigt K. Vetenskaps-Ak. Forhandlingar, 1885, p. 63, pi. 16, fig. 9. 

 tllevision der Ostbaltischen Silurischen Trilobiten, in Mem. I'Ac. Imp. des Sc. de 

 St. Petersbourg, Ser. Vll., vol. 42, p. 13, pi. 1, figs. 1-7. 



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