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The Univalve Shells or Gasteropods of the Tertiaries embraced all the families now living, including land and fresh-water Shells as well as the marine representatives of the type. Some of the latter, as, for instance, the Cerithium, are accumulated in vast numbers. The limestone quarries out of which Paris is chiefly built consist wholly of these Shells.
I do not yet know Holbrook personally. Pickering, of the Wilkes Expedition, is a well of science, perhaps the most erudite naturalist here. Haldeman knows the fresh-water gasteropods of this country admirably well, and has published a work upon them. Le Conte is a critical entomologist who seems to me thoroughly familiar with what is doing in Europe.
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