26 
1906. Chadwick, Geo. H.: Notes on Wisconsin Mollusca; Bull. Wis, Nat. Hist. Soc., 
4, p. 83. Planorbis trivolvis Say, large form. This is the large form of 
trivolvis approaching macrostomum. 
1910. Latchford, F. R.: Conchological Notes; Ottawa Nat., XXV, p. 19. Kettle falls, 
east end Rainy lake. Corpvlentum. The shells referred to binneyi, from 
Rideau canal and river, are referable to the new species, infracarinatum. 
1911. Walker, Bryant.: A Check-list of Michigan Mollusca; Mich. Acad. Sci., 13th 
Rept,, 1911, p. 125. Is the true corpulentum, but its inclusion in the 
Michigan fauna is doubtful. 
1918. Walker, Bryant.: A Synopsis of the Classification of the Fresh-water Mollusca 
of North America, etc.; Misc. Pub., Mus. Zool., Univ. Mich., 6, p. 98. 
Corpulentum. 
1926. Winslow, Mina L.: A Revised Check List of Michigan Mollusca; Oc. Papers, 
Mus. Zool., Univ. Mich., 181, p. 14. Corpulentum. See Walker's paper, 
1900. 
1926. Mozley, Alan: Molluscs from the Manitoba-Ontario Boundary; Nautilus, 39, 
p. 126. Various localities on Winnipeg river. All apparently typical 
corpulentum, but specimens not examined. 
1928. Mozley, Alan: New Records of Western Canadian Mollusca; Nautilus, 42, 
p. 17. Indian Bay Station, Falcon bay, Manitoba. Probably corpulentum. 
1928. Baker, Frank C.: The Fresh Water Mollusca of Wisconsin; Bull. 70, Wis. Geol. 
and Nat. Hist. Surv., I, p. 337, PI. xix, figs. 38-42. Figs. 40-42, Rainy 
lake, Ontario, typical corpulentum. Figs. 38-39, from Minnesota (locality 
unknown) are referable to corpulentum vermilionense. 
1928. Baker, Frank C.: Mollusca from Vermilion and Pelican Lakes, Minnesota, 
■with the Description of a New Variety of Helisoma corpulenta; Nautilus, 
42, p. 131. From Vermilion lake, Minn. Corpulentum vermilionense. 
Typical corpulentum is mentioned on p. 131 as from Trout lake, Ont. 
The specimens quoted from Fall lake, Minn., and Kahnipiminanikok 
lake, Ont., are referable to corpulentum multicostatum. 
1929. Baker, Frank C.: Certain Anatomical Features of the Fresh Water Mollusk, 
Helisoma corpulenta Say; Trans. Am. Micr. Soc., 48, p. 44. Corpulentum 
vermilionense. 
1931. Baker, F. C., and Cahn, A. R.: Freshwater Mollusca from Central Ontario; 
Ann. Rept. for 1929, Nat. Mus., Canada, p. 56. The list of references to 
the literature have already been commented upon above. The localities 
listed on p. 56 are now distributed among the following races or the 
typical form: Trout lake, Ontario, is corpulentum ; St. Joseph, Hill, 
Birch, and Abram lakes, Ontario, and Knife lake, Minn., are corpulentum 
multicostatum ; Marchington river and Blackstone lake are infracarinatum. 
1932. Baker, Frank C.: New Species and Varieties of Helisoma and Gyraulus from 
Canada; Nautilus, 46, pages 6-9. Multicostatum, whiteavesi , and in/ra- 
carinatum. 
1934. Henderson, Junius: Some Western Fresh Water Mollusks; Nautilus, 47, p. 87, 
PL 9, fig. 2. Describes and figures the true binneyi previously confused 
with corpulentum. 
REFERENCES NOT INCLUDED IN ABOVE BIBLIOGRAPHY 
Baker, Frank C.: 1930. Influence of the Glacial Period in Changing the Character 
of the Molluscan Fauna of North America; Ecology, XI, pp. 469-480. 
1931a. The Classification of the Large Plan orb oid Snails of Europe and 
America; Proc. Zool. Soc., London, pp. 575-592. 
1931b. Description of a New Variety of Valvata Lewis! Currier; Nautilus,. 
XLIV, pp. 119-121. 
