CHAPTER XXI. 
MOLLUSCGA. 
By 
A. D. ROBERTSON, B.A. 
Tue sources from which the following list is com- 
piled are various. Records of Mollusca collected in 
the neighbourhood of Toronto are to be found in 
papers by A. E. Williamson and Prof. Nicholson. 
The Hon. Justice F. R. Latchford has also kindly 
supplied me with a list of forms which he has col- 
lected. In addition to these lists the collections of 
Dr. William Brodie in the Biological Museum, Uni- 
versity of Toronto, and at the Education Department, 
as well as those made by Dr. A. G. Huntsman and 
the writer, were examined. Specimens in Dr. 
Brodie’s collection are indicated by the abbreviation 
(B) ; those in Judge Latchford’s list by (L). 
The nomenclature follows as far as possible that 
of Dall’s Land and Fresh-water Mollusks in the 
Reports of the Harriman Alaska Expedition. 
GASTEROPODA PROSOBRANCHIATA. 
Family Valvatidae. 
Valvata tricarinata, Say. Toronto Bay, Grenadier 
Pond, Etobicoke Creek. 
“sincera, Say. Grenadier Pond. 
“«  piscinalis, Miiller. ? 
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