1883. ] Recent Literature. 767 
continent continued to be occupied by fresh-water lakes of the 
kind last referred to during the middle and latter portions of the 
Tertiary period, but they were much less in size than those which 
previously existed. They also gradually became smaller, and 
finally disappeared by being drained of their waters, or remnants 
of them remained to become the salt-water lakes of to-day.” 
After a review of all the species, including the few Devonian, 
Carboniferous, Jurassic and Triassic, and Cretaceous species, the 
bulk of the review is devoted to the Laramie species. Each spe- 
cies is well illustrated by excellent drawings. In conclusion the 
' suggested.” 
