1938 iii, 304 p., num. figs & pls, 4to, cloth. Library stamp & Ex libris (bookplate) of John Crerar Library, Chicago. Includes numerous chapters on insects: Arachnida, Scorpionida, Ricinulida, Acarina, Diplopoda, Collembola, Orthoptera (Gryllidae), & Formicidae. But also papers on Flora, Planarians, Nematoda, Molluscs, Fishes, Reptiles, Birds, Mammals.