1917] The Ottawa Naturalist. 21 



other times.. It has also been taken at Toronto and was abundant at 

 St. William's. 



6. Polygyra say ana Pilsbry. This species occurs sparingly at 

 De Grassi Point, only five mature examples having been found. The 

 dates of these are July 3rd, 25th, August 15th, 19th, September 20th. 

 These were taken in both hardwood forest and poplar woods. I also 

 took another specimen at Canoe Lake, Algonquin Park, July 26th, 

 1916. 



7. Polygyra fraterna (Say). Adult and young individuals of 

 this species were very common at De Grassi Point, throughout the 

 season from April 27th to September 20th, particularly in the latter 

 month and in early spring. It was very generally distributed in the 

 woods. I found it also in a low wooded ravine at Go Home Bay, July 

 16th, and on Giant's Tomb Island, July 30th. It is also common at 

 Toronto and St. William's. 



ClRCINARIIDAE. 



8. Circinaria concava (Say). De Grassi Point, common and 

 generally distributed in moist woods, mature specimens occurring 

 throughout the season. It is likewise common at Toronto, Miss Ford 

 having collected a number of specimens in the vicinity of the city 

 (Mimico, York Mills, Lambton and the "old Belt Line Cut"), from 

 July 22nd to September 4th; I have also found it here in May. It 

 grows to a larger size at Toronto than at De Grassi Point. I have 

 observed this species feeding upon Zonitoides arborea. 



ZONITIDAE. 



9. Omphalina fuliginosa (Griffith). De Grassi Point, fairly 

 common in the hardwood forests, adults having been taken from June 

 29th to September. When inactive they were usually found under 

 dead leaves. I have also taken it in the vicinity of Toronto. 



10. Omphalina inomata (Say). De Grassi Point, August 19th 

 and 20th, four mature specimens from the maple-beech woods. These 

 are the only specimens of this species that I have seen. It is one of the 

 rarest species in this locality. 



11. Vitrina limpida (Gould). During the latter part of June I 

 first noticed the delicate shells of this species under boards and 

 rubbish along the edge of a belt of trees skirting the lake shore at 

 De Grassi Point. The ground here is low and the trees consist largely 

 of tall elms, basswood, white cedar and balsam fir with nannyberry 

 {Viburnum lentago) and hawthorns in the more open places and 

 along the edge next to the pasture. Some young individuals were 

 found with the shells but they were more abundant in the grass along 

 the edge of the pasture, where it was necessary to lie down and examine 

 the ground closely in order to detect them. These immature specimens 

 grew gradually larger during the summer and full grown specimens 

 were seen in September. 



