Title: The biology of the amphibia
Identifier: biologyofamphibi00nobl ()
Year: ()
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RELATION OF AMPHIBIA TO THEIR ENVIRONMENT 439 diemyctyli (Fig. 138) that it may be used as a ready source of supply for class-room demonstration of this parasite (Hegner, 1920). The integument of aquatic Amphibia frequently supports a rich protozoan fauna. Wenrich (1924) reports one flagellate and seven ciliates from the skin of tadpoles, and Sassuchin (1928) has added a list of species which he has found in the slime of the tadpole skin. Under laboratory conditions Cryptobranchus
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Fig. 138.—Trypanosoma di- Fig. 139.—Opalina ranarum, a ciliate parasite emyctyli. (After Nigrelli.) of frogs. (After Metcalf.) frequently develops a rich growth of Vorticella, and various free- swimming ciliates may be found in the mucous secretion of the integument. These in themselves do not appear to be patho- genic but they are often accompanied by a growth of mold which causes great injury. Among the ciliates in the intestines of tadpoles and frogs the opalinids are perhaps the most common. These have a ciliated body, several nuclei, but no mouth. Although they may reach a diameter of nearly a millimeter, they apparently do little dam- age to the body of their host. Opalinids (Fig. 139) are found in

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