A Treatise On Zoology volume 4

Cover A Treatise On Zoology volume 4
A Treatise On Zoology volume 4
E Ray Edwin Ray Lankester
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, in birds (Fig. X. 5). Oymogaster, Jaeg. , in Cetacea (Fig. X. 4). FAMILY 5. GASTEROSTOMIDAE. Mouth ventral ; anterior terminal sucker imperforate, surrounded by tentacular-like processes ; genital pore at the hinder end of body ; intestine sac-like, unforked, short. Gasterostomum, v. Sieb. , in intestine of fish (Fig. X. 8). Gasterostomum fimbriatum, v. Sieb. , lives in Perca flnviatilis ; the egg gives rise to a larva which makes its way into Unio or Anodon; a sporocyst is formed in the live...r or gonad ; and within this arises the peculiar cercaria known as BucepJialus, v. Baer (1), from its resemblance to the head of an ox (Fig. XIV. ). When liberated they make their way out through the exhalant siphon and live freely in the water for a few hours. This cercaria is destined to be swallowed by the second intermediate host, Leuciscus erythroph- thalmus, in which it encysts itself in the wall of the mouth, or on the gills, and when Leuciscus is devoured by the perch, the cyst is dissolved, and sets free Gasterostomum, into which Bucephalus (as Wagener showed, 1 In specimens of A mmocoetes great numbers of Tetracotyle sometimes occur in the vascular membrane covering the brain (Brown, Qu.

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