23 
flexed lip. There are five whorls, three basal whorls with the body whorl 
rounded, the inner ones subcarinate. The part of the body whorl near the 
lip suddenly enlarges, forming a very great axial height at this point. 
The specimen measures as follows: H. 15-5; Gr. diam. 25’ 5; Ap. H. 18-0; 
D. 9*0 mm. The height at the aperture is 18*5 mm., whereas that part of 
the shell, body whorl, on the opposite side of the aperture, measures only 
12*5 mm. It would be very interesting to see more of the shells from this 
lake. 
Mr. A. LaRocque says of this species: 
“I have sarnie twenty lots of this species in my collection, from various localities on 
Rideau river all the way from Rideau falls, where it empties into Ottawa river, up to 
Burritt rapids, about 40 miles from Ottawa. Also a lot from Rouge river at St. 
Andrews, Quebec, near its junction with riviere du Nord. I have found no infracarina- 
tum in Ottawa river and no typical trivolvis in Rideau river.” 
The geographic distribution of infracarinatum appears to be from 
Quebec west to Alberta and south to southern Ontario and northern New 
York. 
IDENTIFICATION OF CORPULENTUM REFERENCES IN THE 
LITERATURE 
1824. Say, T.: Original Description in Long’s Expedition, II, p. 262, PI. xv, fig. 9. 
Lake of the Woods, Winnipeck River, etc. Type localities. 
1837. Beck, H.: Index Molluscorum, p. 118. Corpulentum. 
1840. Whittimore, T. J.: Note on Planorbis corpulentus; Am. Jour. Sci. and Arts, 
38, p. 193. Otter Creek, Middlebury, Vt. Trivolvis , approaching macros - 
tomum. 
1841, Gould, A. A.: Report on the Invertebrata of Mass, p. 201. “Planorbis cor- 
pulentus seems little else than an exuberant growth of the shell.” Trivolvis. 
1841. Adams, C. B, : Catalogue of Mollusca of Middlebury,, Vt.; Am. Jour, Sci. and 
Arts, 40, p. 269. Referred to lentus authors (non Say) and referable to 
the large form of trivolvis approaching the race macrostomum. 
1842. Adams, C. B.: In Thompson’s History of Vermont, p. 155 (reprint, p. 5). 
Trivolvis. 
1843. De Kay, J. E. : Zoology of New York, Mollusca, p. 64, PI. viii, fig. 185, a, b. 
From 1 lake Champlain. Is the large form of trivolvis approaching macro- 
stomum. Abo called lentus by many of the early writers. 
1844. Haldeman, S. S. : Mon. Fresh Water Univ. Shells of N.A., p. 19, PI. iii, figs. 7-9. 
From Lewis river, Washington (formerly Oregon). Binneyi. 
1845. Wheatley, Chas. M.: Cat. of the Shells of U.S., p. 21. Trivolvis. 
1848. Anthony, J. G,: List of Land and Freshwater Shells Found in the Vicinity of 
Cincinnati, Ohio, Trivolvis. -» 
1852. Jay, J. C.: Cat. of Recent Shells, etc., 4th Ed., p. 267. Two specimens in Jay col- 
lection, one from Winnipeck river, are infracarinatum. 
1852. Gould, A. A.: Wilkes U.S. Expl. Exped., Mollusca, p. 114, fig. 130, a, b, Columbia 
river, Oregon. Binneyi. 
1852. Lapham, I. A.: Systematic Catalogue of the Animals of Wisconsin; Trans. Wis. 
State, Agric. Soc., II, p. 368. N.W. Territory (Say) refers to the true 
corpulentum, which is not found in Wisconsin. 
9505—3 
