THE HAMILTON ASSOCIATION, 2 1 



for local collectors (the writer included) ; Dr. Spencer, F. G. S. ; the 

 Rev. Dr. Hartley Carmichael ; my friend, the late Wm. TurnbuU, 

 etc. On breaking up a few of the water-worn shingles which had 

 been detached from above last spring, I discovered remains of two 

 or three Lingul^e, which differed from any figured, at least in one 

 case ; and from a large flag, containing two Trenton fossils, the in- 

 terior cast of a valve which appeared to bear a near resemblance to 

 the Clinton Lingute (L. perovata — Hall). Close beside it, another in 

 a badly fractured condition, displayed the concentric and longitudi- 

 nal lines characteristic of the Trenton Obolus Filosus, figured on page 

 200, 3rd edition, Dana's Manual. The hollow cast of a Lingulae 

 valve resembling L. quadrata (Trenton also), was obtained at the same 

 time and place, and I cannot find either mentioned as putting in 

 appearance in Canada, by Billings, Spencer, or Nicholson. So we 

 may record the circumstance. 



Some of the hard red shingles at the canal contain numerous 

 specimens of the minute Ostracod, named by T. R. Jones, Royal G. 

 S. London — Leperditia Canadensis. I was surprised to find em- 

 bedded in a grey limestone there, several examples of this interesting 

 microscopical group (varieties probably), differing in size (and shape 

 occasionally). May not this represent different stages of growth, as 

 well as varieties proceeding from the parent stock ? A Cyrtodonta, 

 nearly related to C. Hindi, is rarely found at the Iroquois Beach, 

 and a fine cast of Orthis Occidentalis (Hall) is occasionally discov- 

 ered. The late Mr. Turnbull informed me he preferred the modern 

 lake beach to any locality near Hamilton for lower Silurian fossils. 

 The shingle there is free from adhering gravel or sand, and one can 

 more easily detect outside indications of the organism inside. That 

 may be so, but for my part, I formerly found more rare specimens in 

 the gravel pits at Slabtown than at the Beach. I have not been 

 there for many years. It appears to be an unknown hunting ground 

 to them. 



The lake shore near Winona and Grimsby furnished me with 

 some very fine Cambro Sil. Slabs during the past summer ; some few 

 are in one of the cases of the museum, but the greater part were too 

 large for the limited space on the shelves, and were forwarded to the 

 Redpath Museum, Montreal, which already possesses an interesting 

 collection of our local fossils. 



