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Show 372 ENTOZOA. appears, been observed in certain Monkeys and even in Man, but theyare said to be never found in the Wild Boar( 1 ). The AonosTOMA, Le Sauvage, Ann. des Sc. Nat., is closely allied to this genus. The animal inhabits the amnios of the Cow. C<ENURUS, Rud. Here we find several bodies and heads adhering to the same bladder. C. cerebralis; Trenia cerebralis, Gm.; Gretz., XX, A, B; Encyc., XL, 1-8. This celebrated species is developed in the brain of Sheep, destroys a portion of its substance, and pro· duces a disease called the Staggers (tournis), because it compels them to turn on that side as if affected with vertigo. The same species has been observed in the Ox and other Ruminantia, where it produces similar effects. Its bladder is sometimes as large as an egg, and its parietes are thin, fibrous, and exhibit evident contractions. The little worms are hardly half a line in length and re-enter the bladder by contraction(2). ScoLEX, Mull. Where the body is round, pointed behind, extremely contractile, and terminated before by a sort of variable head, round which are two or four suckers, sometimes resembling ears or ligula::. Those that are known are very small and inhabit fishes(s). I have seen a large one, S. gigas, Cuv.; Gymnorhynchus reptans, Rud., Syn., 129, which penetrates into the flesh of the Sparus raii, L. The middle of its body is inflated into a bladder, which, during the life of the animal, alternately widens and contracts in the middle. (1) For the remaining species, see Rud., Ent., 11, p. ii, p. 215, and El., 179. (2) Here should probably come the genus Ecauncoccus, Rud., n, p. ii, 247, but I have not seen it, and have no idea of it sufficiently clear to enable me to class it. · (3) See Rud., Hist. II, p. 3, and Syn., 128. PARENCHYMATA. 373 FAMILY IV. CESTOIDEA. The fourth family comprises those wh' h external suckers. IC are destitute of But one genus is known. LIGULA, Bloch. Of ~11 the Entozoa, these appear to be the • " T~elr body resembles a long riband. it is B. most Slmply orgamzed. Wlth a longitudinal stria and fi 1' . at, obtuse before, marked ternal organ whatever is ~erce t~l: stna~ed transversely. No ex· but the ova, variously distribufed in 't=n~ mternally we find nothing They inhabit the abdomen f .e ength of the parenchyma. · f o certam Birds d . variOus resh·water Fishes I . ' an particularly of t . , enve opmg and c t . . mes to such a degree as t d ons rlctmg their intes t> • o estroy them At . - even perAOrate the parietes of th . bd. certam periods they them, elr a omen to leave it. One of L. abdominalis, Gm.; L. cinO'ulu inhabits the Bream( I) I 5 m, Rud.; Gretz., XVI, 4-6 'd · n some parts of It 1 h ' consl ered agreeable food. a y t ese worms are (1) For the others, see Rud. Hist II N.~. ~n the intestines of Seals, and' of~y· II, P· 12, and Syn., 132. ::ary snnilar to the Ligula:, but with genit~ds that prey on Fishes, we find Worms t of the Bothryocephali. M. Rudol hi organs, and even a head analogous to the same as the Ligula: of F' h . p supposes that these Worms of B' -d. after th 18 es, w hlch can onl . u s are form ey have passed from the abdomen of thy laacqun:e their full development er. e tter mto the intestines of the I 'I |
