FISHES—REGAN. 45 
the essential similarity of the American and Australian fossils, which he included in 
one genus, Miolania. However, admitting their relationship and their distinctness 
from all other Chelonians, it seems to me that these two well-marked types may he 
regarded as different genera. If it be considered that several recent genera of the 
Chelonia are represented in the Eocene by species quite like the modern ones, the 
occurrence in Australia and South America of types so dissimilar—one of which 
dates back at least to the time when Lord Howe Island was part of the continent 
of Australia, and the other is known from deposits that may be Miocene or perhaps 
earlier—can be explained without inventing a Tertiary land-bridge. 
The conclusion is that neither the fresh-water fishes, nor the marine fishes, whether 
Antarctic or South Temperate, support the theory that Antarctica has connected 
Australia with South America in Tertiary times, nor, so far as I can read the evidence, 
does the distribution of other groups of animals confirm this view. 
