Geology and Natural History. 387 
and silver, the samples which I have seen containing also lead.” 
Samples of both these ores have been sent us by Mr. Hill, and 
when they arrive we shall hope to determine the species to which 
the tellurium ore belongs. 
6. Contributions to a Fauna Canadensis, being an cae “of 
the animals dredged in Lake Ontario in 1872; by H. AttnyNE 
Nicnotson. (From the Canadian Journal.)—A preliminary re- 
port of these paps was ere ie "oy Annals pee Maga- 
zine of Natural History, vol. x, p. October, is eee 
present paper includes most of ther ss 08 the previous one, with 
a revised list of the species and descriptions of some that are re- 
garded as ne 
The dredgings were all in shallow water as compared with those 
made by Mr. 8. L Smith, in Lake Superior, in 1871.* The greater 
part of the species were obtained in Toronto Bay, where the 
depth was from one to three fathoms. Some dredgings were also 
shallow water, and most of them are species that are widely 
distributed in the fresh waters of the northern United States 
and Canada. Valvata tricarinata was the only species found 
described and figured as new. One of these, Clepsine patellifor- 
mis, pope to be perfectly identical with : elegans, described 
by me in this Journal, vol. iii, p. 132, Feb., 1872. The color dif- 
fers Haus from the variety ‘originally described, but the color- 
Variety that he describes is not uncommon at as Ss Haven. Prof. 
Nicholson states that this species carries the young attached 
ir 
of i to 
cot cg, misht have added that the eggs before re hatching are re also retained in the 
cavity beneath the body, in a cluster, and thus incubated till they hatch, the 
