. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 290 Bulletin Museum of Comparative Zoology, Vol. 140, No. 6. Text-figure 5. Ranges in pH of Georgia water. (From Cherry, 1961, fig. 8. yond the area of maximum Pliocene and Pleistocene flooding. Both rivers have a small unionid fauna (Table 1). The domi- nant species in the St. Marys is E. c. crassi- dens, and in the Satilla, it is E. crassidem downiei. If the Satilla was a refugium, it is possible that downiei had a chance to evolve there and that E. c. came back from the west by a route not explained her
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 290 Bulletin Museum of Comparative Zoology, Vol. 140, No. 6. Text-figure 5. Ranges in pH of Georgia water. (From Cherry, 1961, fig. 8. yond the area of maximum Pliocene and Pleistocene flooding. Both rivers have a small unionid fauna (Table 1). The domi- nant species in the St. Marys is E. c. crassi- dens, and in the Satilla, it is E. crassidem downiei. If the Satilla was a refugium, it is possible that downiei had a chance to evolve there and that E. c. came back from the west by a route not explained here. The Waecamaw River system in South and North Carolina is of the same origin as the St. Marys. It is completely on the Wicomico and Chowan formations and has a typical coastal assemblage of Unioni- dae (Table 2), but it is remarkable in having an endemic species, E. uaccomo- ivensis. Among the small river systems of more recent origin on the Coastal Plain in the Apalachicolan region in which Unionidae have been found are the Econfina and the Wasassasa. In the Econfina occur Elliptic icterina, ViUosa lienosa, V. vibex, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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