25 
river, Florida), H. duryi intercalare (Pilsbry) 47562; Bexar county, Texas, 
H. tenuis (Phil.) 47554; Miami, Florida, 153412, 47558, are H. duryi 
intercalare (Pilsbry) ; near Portland;, Oregon. 47611, H. occidental 
(Cooper); lake Simcoe, Canada, 57555, is H. trivolvis (Say). (Numbers 
from the Stearns’ collection, U.S. Nat. Mus.) 
1881. Melville, J. C.: List of Mollusca obtained in South. Carolina and Florida 
(principally at the island of Key West, in 1871-72); Jour. Conch., Ill, 
p. 167. As the reference does not state whether the specimens came from 
South Carolina or Florida it is impossible to infer what the species may 
have been. It was not corpulentum. If from 1 Florida the species was 
probably H. duryi intercalare (Pilsbry). 
1883. Cope, E. D.; On the Fishes of the Recent and Pliocene Lakes of the Western 
Part of the Great Basin, and of the Idaho Pliocene Lake; Proc. Phil. 
Acad. Sci., p. 140. The Planorbis corpulentus recorded' from Upper 
Klamath lake is referable to a form of Helisoma occidentale (Cooper). 
1885. Christy, Robert M.: Notes on the Land and Fresh-water Mollusca of Mani- 
toba; Jour. Conch. (Leeds) IV, p. 348. Lake of the Woods (after 
Dawson), Corpulentum. 
1886. Clessin, S.: Conch. Cab., Planorbis, p. 144, PI. 17, fig. 4; PI. 22, fig. 1. Binneyi. 
1887. Grant, U.S.: Notes on the Mollusean Fauna of Minnesota; Ann. Rept. Geol. 
Nat. Hist, Surv, Minn., XVI, p. 484. Corpulentum vermilionense. 
1893. Walker, Bryant: The Shell-bearing Mollusca of Michigan; Nautilus, VI, p. 136. 
Trivolvis (part); corpulentum (part). 
1894. Walker, Bryant: A Review of Our Present Knowledge of the Mollusean Fauna 
of Michigan. Detroit. P. 18. Trivolvis. 
1894. Stearns, R. E. C. : The Shells of the Tues Marias and Other Localities along 
the Shores of Lower California and the Gulf of California; Proc. U.S. 
Nat. Mus., 17, p. 166. The Cape St. Lucas shells referred to are either 
tumens or tenuis. The Columbia River references are to binneyi. The 
Lake Winnipeg references probably to the true corpulentum. 
1S99. Hanham, A. W.: A List of the Land and Fresh-water Shells of Manitoba; 
Nautilus, XIII, p. 6. Lake of the Woods (Dawson). Corpulentum. 
1900. Walker, Bryant: The Genuine Planorbis corpulentus, Say; Nautilus, XIII, 
pp. 133-138. On Plate iii, figs. 1 to 3, are corpulentum ; figs. 4 to 6 are 
corpulentum vermilionense from Vermilion lake, Mnm. Fig. 7 is appar- 
ently corpulentum, but the locality Vermilion lake, Hadson Bay territory, 
is open to question. See further under corjmlentum in body of paper. 
Footnote p. 134; the specimen in the Jay collection is infracarinatum, not 
corpulentum. Specimen from Cooke collection is also infracarinatum. 
The specimens from the Haines collection are small trivolvis. 
1905. Dali, William H.: Alaska Land and Fresh Water Mollusks; Harriman Alaska 
Series, XIII, p. 87. Fig. is corpulentum , original figure of Say. All 
references are to true corpulentum excepting following: Isle La Crosse 
lake is infracarinatum; Knee lake, Keewatin, is infracarinatum; lake 
Simcoe, Ontario, is trivolvis. 
1905. Whiteaves, J. F.: List of some Fresh-Water Shells from North-Western Ontario 
and Keewatin; Ottawa Nat., XIX, p. 29. English river below Manitou 
falls. Corpulentum. Same, p. 32. Knee lake, on Hayes river. Infra- 
carinatum. (Specimens collected by E. A. Preble from Knee lake, now 
in Smith. Coll., are this species.) 
1906. Whiteaves, J. F.: List of Land and Fresh Water Shells from the District of 
Keewatin; Geol. Surv., Canada, Ann. Rept., vol. XVI, p. 164. Minnitaki 
lake; lac Seul; Sioux Outlook, English river. Corpulentum. Root River 
specimens are corpulentum multicostatum. 
