HAMILTON SCIENTIFIC ASSOCIATION 113 



On extracting some of the limestone shingle embedded it was found 

 to be exceedingly hard under the hammer, and the fossils inside 

 were more or less injured, but on selecting a few of the softer ones 

 I succeeded in obtaining a considerable number in fair preservation 

 corresponding with others obtained from limestone lying loose 

 along the lake shore. 



Mr. Bartlett, a member of the Geological Section, noticed re- 

 cently' how exceedingly difficult it was to break up some of the 

 rocks on the shore at Winona. If we can believe that much of the 

 material has been derived from the glacial drift there it may ac- 

 count for it. Only the hardest rocks, with few exceptions perhaps, 

 were likely to resist the crushing force of the glacier. The writer 

 has much pleasure in submitting for your inspection a few of the 

 specimens extracted from the boulders of the clay. The tail shield 

 of the Trenton triloi)ite, Asaphus Platycephalus, was found in loose 

 shore shingle. It may have been washed out of it, however, for 

 two others were discovered embedded in the blue clay. These were 

 not as well preserved as the one produced, but could be easily 

 recognized.- Some of the members may recollect I laid before you 

 last year another Trenton fossil, Avicula Tre?itone?ises, an internal 

 cast, I think. Fortunately this summer I succeeded in obtaining 

 one of the valves displaying the grooving — ornamentation. 



Another interesting specimen is the small Lingula, derived also 

 from the same series. R probably 'seems new to me. During my 

 stay at Winona Park in June and July to the first of the latter, in- 

 clusive^ I paid two visits to the abandoned quarries at Grimsby, 

 chiefly with a view of obtaining a few Niagara bryozoons for Dr. 

 Whiteaves. I felt satisfied no crinoids were obtainable, since my 

 predecessor in office, Mr. Schuler, had raked in such a large num- 

 ber previously by means of the claw-like rake, which proved to be 

 a capital implement for working in the soft Niagara shales which 

 had been detached by my friend and fellow-worker, the late Dr. 

 Johnson Pettit, formerly or had since fallen from above. 



The upper Clinton green band, so rich in fucoids, hardly af- 

 forded a better prospect than the overlying shales themselves. We 

 had in former years removed every specimen that we could reach, 

 until merely the one was left. This was in such a dangerous posi- 



