CHAPTER XXI. 

 MOLLUSCA. 



By 

 A. D. ROBERTSON, B.A. 



THE 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 PKOSOBRANCHIATA. 



Family Valvatidae. 

 Valvata tricarinata, Say. Toronto Bay, Grenadier 



Pond, Etobicoke Creek. 

 " sincera, Say. Grenadier Pond. 

 " piscinalis, Miiller. ? 

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