230 ON SOME NEW TRILOBITES FROM CANADIAN ROCKS, 



that the use of but one name was not uncommon among the Gauls. 

 The meaning of CIVIS TREVEE, also, is not " a citizen of Treves," 

 but a Trever citizen, i. e. a citizen of the people called Treveri, or 

 Treviri. 



ON SOME NEW TRILOBITES FROM CANADIAN ROCKS. 



BY E. J. CHAPMAN : 



PEOFESSOE OF MINEEAIOGT AND GEOLOGY, UNIVEESITT COLLEGE, TOEONTO. 



Head before the Canadian Institute, March 20th, 1858. 



I. ON A NEW SPECIES OF ASAPHUS FROM THE LOWER SILURIAN 

 ROCKS OF UPPER CANADA. 



§1. Introductory Notice : — In the autumn of 1856, I communicated 

 to the " Canadian Journal," under the title of Asaphiis CaJiadensis, 

 a brief notice of a supposed new trilobite from the Utica Schist (Lower 

 Silurian) of Whitby in Canada West ; and in a subsequent number of 

 our Journal, I gave a more detailed description of the form. 

 At the same time, I pointed out that Professor Hall of Albany believed 

 it to be identical with a species founded by him (under the name of 

 Asaphus{?) latimarginatus) on two imperfect caudal shields, figured in 

 the first volume of his " Palaeontology of New York." At the period 

 in question, I was not in a position, from the want of works of refer- 

 ence and other sources of information, to claim this trilobite as actually 

 new ; but an extended investigation having shewn it to be really a dis- 

 tinct form — a view adopted also by others — I now publish a complete 

 description of the species, together with as accurate a figure as I am 

 able to get executed in Canada. In this communication, also, I have 

 attempted to shew, by a brief analysis of all the fairly-established 

 species of the genus Asaphus, that our Canadian species is undoubtedly 

 distinct. I should state, with regard to the figures of Professor Hall, 

 alluded to above, that it is impossible to determine whether our species 

 be identical or not vnth these. In the words of Barrande, in his great 

 work on the Silurian Basin of Bohemia, they are too incomplete to be 

 determined with any certainty.* For this reason, in the Museum of 



* Divers fragments d'Amerique iiommds Asaphus par J. Hall, et figures dans la Pal6on- 

 tologie de New York, sont trop ineomplets pour 6tre surement d^termin^s. Barrande s 

 SystSme Silurien du Centre de la Bohfeme. vol 1, p. 657. 



