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A Contribution to the Life History of Bucephalus longicornutus (Manter, 1954)

Formation of the cyst wall by the cercaria

Formation of the cyst wall by the cercaria

(a) Experiments were made to determine the reaction of cercariae to increasingly diluted sea-water. Twenty 4in diameter finger bowls were set up, each containing approximately 100 cercariae in 40cc of sea-water. Five cc of distilled water were added to the first finger bowl, 10 to the second, 15 to the third, etc.

(b) The body wall muscles of a freshly killed Tripterygion sp. were ground up with a mortar and pestle. The few cc of liquor obtained were decanted from the residue into a Syracuse watch glass. Approximately 10 cercariae were added to this liquor with care to exclude as much sea-water as possible.