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Abstract Three forms of macrocyst were studied in sheep. On the basis of their dimensions and cyst-wall ultrastructure, thin cysts were found to be a separate species from fat and oesophageal cysts, but were also transmitted by cats. Sporocysts derived from fat and thin cysts had similar dimensions. It is proposed that the thin species be named S. medusiformis n.sp.
Collins et al. (Mon,) studied this question.