This section is from the book "A Manual of Materia Medica and Pharmacology", by David M. R. Culbreth. Also available from Amazon: Manual of Materia Medica and Pharmacology.
This class includes the oviparous animals that have fins and a covering of scales or plates. They breathe by gills, live almost entirely in water, swim instead of walking or flying, have a complete cranium, and a lyriform shoulder girdle.
 
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