A List of Minerals and Organic Remains. 85 
Huron, sometimes five feet long; but in the Lake of the 
Woods and Lake Simcoe little more than an inch in length. 
Besides several of the ordinary forms, eight kinds from 
Lake Huron, have been described in the Geol. Transac- 
tions of London, differing in the shape and position of the 
siphuncle, in the position of the chambersand their inequal- 
ity of dimension in the sarne individual; and in external 
configurations, indicative of peculiar structure in the cham- 
bers. Major Delafield’s collection contains a flattened or- 
thoceratite from Lake Huron, seven inches long, nearly twe 
inches broad at one end; and one inch and a quarter at the 
other. One face of the fossil presents the usual cellular 
divisions ; but the reverse exhibits the appearances in the 
accompanying diagram. (See the plate at the end of this 
No.) At the larger end of this specimen, the siphuncle is 
of great magnitude; but at the smaller, it is not much more 
than a quarter of aninch in diameter. Its chambers are 
very unequal. . 
The isles on the north of Lake Huron possess a curious 
and complicated chambered shell which approaches near- 
est to an orthoceratite. There are at least three varieties.* 
At the Portage of Notawasaga, on Lake Simcoe, I found 
two curved orthoceratites. ‘The one now before me is two 
inches long by half an inch broad, and bent into a semi- 
circle. It has thirty-four chambers in the lower two thirds 
of its length, those near the bottom being very small. 
Conularia.—During a short search below the bridge, at 
the Falls of Montmorenci, | found three specimens of the 
rare organic remain, the conularia quadrisulcata; exclu- 
sively, I think, belonging to carboniferous limestone. I met 
with another at the portage of the bay of Quinté, in Lake 
Ontario, and a small fragment of this family, both at Mon- 
treal and on Lake Simcoe; but in neither case could I de- 
termine the species. 
Among the univalves without chambers, I have only met 
with the euomphalus, trochus and turbo, in Lake Huron; 
but the second, only at Montreal, the trochus ‘and turbo on 
the north shore of Lakes Ontario and Simcoe, and the last 
plentifully in the Lake of the Woods. 
Terebratule abound every where, chiefly of two kinds: 
* Geol. Trans. for 1823. 
