. The Canadian field-naturalist. February, 1932] The Canadian Field-Naturalist 33. FiGtTRE 2. Mammillary mounds in the Bonnechere Flat. the Bonnechere valley at Renfrew was developed. The peculiajT-looking moiunds that protrude from the surface of the fiat represent merely a transi- tionary stage in the development of the flat, the moiHids being knolls of glacial materials not completely buried by the stratified clay. MOLLUSKS FROM ST. JOSEPH'S ISLAND, ONTARIO, CANADA By HORACE G. RICHARDS University of Pennsylvania DURING August, 1930, I was able to make a small collection of moUusks from the
. The Canadian field-naturalist. February, 1932] The Canadian Field-Naturalist 33. FiGtTRE 2. Mammillary mounds in the Bonnechere Flat. the Bonnechere valley at Renfrew was developed. The peculiajT-looking moiunds that protrude from the surface of the fiat represent merely a transi- tionary stage in the development of the flat, the moiHids being knolls of glacial materials not completely buried by the stratified clay. MOLLUSKS FROM ST. JOSEPH'S ISLAND, ONTARIO, CANADA By HORACE G. RICHARDS University of Pennsylvania DURING August, 1930, I was able to make a small collection of moUusks from the Canadian shores of the North Channel of Lake Huron at Gravelly Point, St. Joseph's Island, Ontario. Although the list is small and differs only slightly from published lists from other parts of Georgian Bay and northern Michigan, it is thought ad- visable to record it at this time. The following species were found:—•(!) Gastropoda Lymnxa palustris (Mull) Lymnxa obrussa Say Physa vinosa Gould Helisoma antrosum (Conrad) 11 am indebted to Mr. E. G. Vanatta for help in the identi- fication of the specimens. A collection has been deposited in the Academy of Natural Sciences of Philadelphia. Helisoma campanulatum (Say) Gyraulus defledus (Say) Valvata tricarinata Say Amnicola limosa (Say) Amnicola lustrica Pilsb. Cincinnatia binneyana Han. Campeloma rufum (Hald.) (young) Campeloma decisum Say Pleurocera subulare (Lea) Gonyodiscus cronkhitei var. anthonyi (Pilsb.) Succinea retusa Lea Pelecypoda Pisidium noveboracense Prime (?) Sphxrium solidulum (Prime) Anodonta marginata Say (?) Lampsilis siliquoidea Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
Size: 2952px × 846px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafieldnaturalistsclub, bookcentury1900, bookcolle
