96 



tiie same I'ed. In his " Notes on, and the precise geological position of 

 Sipho7iotreta Scotica, Davidson," presented and read at the meeting 

 of the Club February 10th, 1887 Mr. Ami mentioned these species, 

 and the facts obtained were therein recorded. Besides the above a 

 species of graptolites, obtiiined fioni the Utica has been placed at the 

 disposal of Mr. VVhiteaves, of the Survey, who has had them forwarded 

 to Piof. Lap worth of Mason Science College, Birmingham, the best 

 authority on tliese interesting fossils, for examination. 



The following species ai'e new to the lists already published from, 

 the Utica : 



Orthis emacerata, Meek. 



Leperditia vtinutissima, Hall. 



Beyrichia ccidifera, Hall. 



Trenton Formation. In this formation which is CA-er teeming 

 with abundance of fine material, a number of good finds were made 

 which requii-e more stud-y before publishing the notes on them. In this 

 connection it may not be deemed out of place to mention the fact that 

 Prof. E. O. U I rich, of Cincinnati, Ohio, who on several occasions has. 

 generously lent his assistance in determining critical species of Polyzoa 

 from our rocks, was in Ottawa during the past summer and made an 

 extensive collection at the Brigham quarries at Hull and in other parts 

 of the Trenton here, so that when all the Polyzoa which, he collected 

 are worked up the number of species from that r.emarkable group of 

 organisms will lie considerably increased. 



Potsdam Formation. The exposures of this formation were visit- 

 ed by the Club during the past summer at a general excursion to Buck- 

 ingham, Que., where, besides collecting a fine series of the typical 

 Scolithus Canadensis. Billings a number of previously unrecorded 

 facts were obtained on the evidence of glaciation on the quartzites 

 or sandstones of this formation. These sandstones, a blufi" of which 

 faces the Laurentian rocks in the immediate vicinity to the north, are 

 seen to be deeply grooved, striated and polished. Of the annelid (1) re- 

 mains refei'able to the genus Scolithus, Billings Species, S. Canadensis, 

 was by far the commoner form met, but two very good examples of S. 

 linearis, Hall, were found associated with it. From the notes which 

 iNIr. Ami has made on the subject he is strongly of the opinion thjit the 



