. The Canadian field-naturalist. 7 1926 The Canadian Field-Naturalist VOL. XL OTTAWA, ONTARIO, MARCH, 1926 No. 3 A NEW LYMN/EA By F. R. LATCHFORD T MAY be little less than a zoological crime to regard as new a mollusc of the widely disseminated tribe of Lymnsea (Galba) palustris Linn., the synonomy of which covers pages of Professor Baker's Mono- graph on the Lymnseidae. As might be expected in the case of a species ranging deeply from the boreal pole in three continents, under widely differing ecological conditions, palustris varies greatly. In the vicinity of Ottawa, it is common everywhere
. The Canadian field-naturalist. 7 1926 The Canadian Field-Naturalist VOL. XL OTTAWA, ONTARIO, MARCH, 1926 No. 3 A NEW LYMN/EA By F. R. LATCHFORD T MAY be little less than a zoological crime to regard as new a mollusc of the widely disseminated tribe of Lymnsea (Galba) palustris Linn., the synonomy of which covers pages of Professor Baker's Mono- graph on the Lymnseidae. As might be expected in the case of a species ranging deeply from the boreal pole in three continents, under widely differing ecological conditions, palustris varies greatly. In the vicinity of Ottawa, it is common everywhere on the Ontario side of the river. The large and usually malleated form which is regarded as typical, occurs in Cave Creek, west of Holland Avenue, and elsewhere in ditches and ponds, while a smoother, smaller shell is found in the river itself. On the north shore, palustris seems res- tricted to the Ottawa and to pools and sluggish streams on the terraces below the Laurentian Hills. If it occurs among the hills themselves, I can only say that in more than forty years collect- ing, I have not there found a single specimen. It may yet be found in the Peche, in the long reach above the dam at Ste. Cecile, though it was not in that stream at one time. In other streams of swiftly flowing water and in the many clear, cold lakes in the valley of the Gatineau with which I am familiar, palustris does find a congenial habitat. G. obrussa in Gauvreau Lake is the only galba I have noticed other than one which I cannot but think is specifically distinct from palustris and proper to be regarded as undescribed. The shell was first collected in Chilcott Lake on the memorable day in 1892 when the now famous orchid swamp near-by was discovered by four members of the Field-Naturalists' Club, the late Dr. James Fletcher and W. H. Harrington, and S. E. O'Brien and the writer. On several subse- quent visits, the wonderful botanical attractions of the place were so absorbing that the molluscan fauna
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