. The biology of the amphibia. Amphibians. 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. Fig. 138.—Trypanosoma di- Fig. 139.—Opalina ranarum, a ciliate parasit
. The biology of the amphibia. Amphibians. 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. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill
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