Hyatt, A. — Genesis of the Arietidae.

1889 xi, 238 p., 6 folding tables, 14 mostly heliographed plates, 4to. Later olive cloth with printed title on the spine. A richly illustrated work with much attention to the phylogeny and structural development of these Jurassic ammonites. Published in the series Smithsonian Contributions to Knowledge. Ex library copy from the Crerar library with small stamps on verso of plates (not shining through).The work is preceded by two smaller papers and of the first the margins are brittle. Hyatt's contribution however is good and clean.