Galloway, T. W. Textbook of Zoölogy. P. Blakiston's Son & Co., 1915.
Kingsley, J. S. Textbook of Vertebrate Zoölogy. H. Holt & Co.
Petrunkevitch, A. Morphology of Invertebrate Types. The Macmillan Company, 1916.
T. W. Galloway
Beloit College
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