Olsen, O. W. (1940). Two new species of trematodes (Apharyngostrigea bilobata: Strigeidae, and Cathaemasia nycticoracis: Echinostomidae) from herons, with a note on the occurrence of Clinostomum campanulatum (Rud.). Zoologica: Scient. Contrib. N. York Zool. Soc. 25 (3): 323–328.
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Olsen, O. W.
1940
Two new species of trematodes (Apharyngostrigea bilobata: Strigeidae, and Cathaemasia nycticoracis: Echinostomidae) from herons, with a note on the occurrence of Clinostomum campanulatum (Rud.)