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The alveolar epithelium of larval and adult caecilians is composed of one cell type only, the cytoplasm of which, however, is divided into two divisions: an organellerich part containing the nucleus and a flattened peripheral part which covers the blood capillaries. Apically the cells bear variously shaped microvilli, which are sparse on the flattened areas of the cells. Among the cytoplasmic structures electron-dense bodies and lamellated bodies are prominent. Morphological observations suggest that in the adult the lamellated bodies are derived from the dense ones, which presumably represent lysosomes. Acid phosphatase and unspecific esterase are present in the entire alveolar epithelium. The lamellar material is extruded by exocytosis. A close structural relation between lamellated bodies and multivesicular bodies-as to be found in many mammalsdoes not exist. In the larvae among others there exists an extensive lateral labyrinth between neighboring alveolar cells and a considerable variability of the lamellated bodies. The latter frequently arise within or near fields of glycogen or presumably also within membrane systems.

archivum histologicum japonicum

Fine structural and enzyme histochemical observations on the respiratory epithelium of the caecilian lungs and gills. a contribution to the understanding of the evolution of the vertebrate respiratory epithelium.