. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 82 Bulletin of C oinixiid live Zoolo^ij, Vol. 149, No. 2 ICE SHEET. Figure 1. Trent outlet stage of the Great Lakes. (After Ortmann, 1924, fig. 2.) The darkened area represents the melt water which flowed through the Trent Outlet into the Mohawk River (arrow). The Greater Maumee River system is postulated, and the rivers which formed part of it are numbered. 1. Clinton, 2. Huron, 3. Raisin, 4. Sandusky, 5. Vermilion, 6. lower Cuyahoga, 7. Grand River, Ohio, 8. Grand River, Ontario. The arrow between 3 and 4
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 82 Bulletin of C oinixiid live Zoolo^ij, Vol. 149, No. 2 ICE SHEET. Figure 1. Trent outlet stage of the Great Lakes. (After Ortmann, 1924, fig. 2.) The darkened area represents the melt water which flowed through the Trent Outlet into the Mohawk River (arrow). The Greater Maumee River system is postulated, and the rivers which formed part of it are numbered. 1. Clinton, 2. Huron, 3. Raisin, 4. Sandusky, 5. Vermilion, 6. lower Cuyahoga, 7. Grand River, Ohio, 8. Grand River, Ontario. The arrow between 3 and 4 represents the flow of the Maumee River system into the Wabash. er by way of the Richelieu River. Since the present fauna, with the exception of EUiptio complanata, is from the west, this second explanation is more probable. Ottawa River. It is assumed that the large number of Atlantic slope species in the Ottawa River are derived from the southern side of the lower St. Lawrence River, but this is not documented here. Canadian Interior Basin. (Plate 1, In- sert.) North of the Mississippian Region and the St. Lawrence River system, this vast region comprises more than one third of North America. It is divided into the Arctic and Hudson Bay drainages. The latter has a number of natural con- nections with the St. Lawrence River sys- tem. The Albany River system in Ontario is joined to Lake Superior by Lake Nip- igon and Long Lake, both of which have north and south flowing outlets. The Rainy River-Winnipeg River system is similarly joined to Lake Superior at Sa- ganaga [Seiganagah] Lake which drains both east and west (Clarke, 1973: 6). Most of the unionid fauna of the Canadian In- terior Basin is of Mississippian origin (Table 4). Thirteen of the 16 species in the Hudson Bay drainage are derived from a former confluence of the Minne- sota River, of the upper Mississippi, and the Red River of the North (Plate 1, A). Prior to the recent erection of dams, these rivers were periodica
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