146 Transactions of the Royal Microscopical Society. 
to suppose that B. Haimeanus encysted in Belone vulgaris meta- 
morphoses itself into some species of Gasterostomum in the intestine 
of some big fish which feeds upon the Belone.” 
Specimens of Bucephalus Haimeanus were exhibited to the 
Society by Mr. W. F. Woods, at the Scientific Evening held in 
December, as “ living organisms from the cockle.” 
EXPLANATION OF PLATE XCYIII. 
Figs. 1 to 5 after Yon Baer, 6 and 7 after Lacaze-Duthiers. 
Fig. 1 . — Bucephalus polymorphic ; 1 a, n. s. 
9 — „ sporocyst, n. s. 
different stages of ditto x 20 ; 3 a and b, 
germs from sporocyst, b beginning to 
develop. 
showing change in lateral appendages. 
Haimeanus. 
v 
sporocyst : a young bud. 
