A revision of the adult cestodes of cattle, sheep and allied animals ... / by C.W. Stiles ... and Albert Hassall.

  • Charles Wardell Stiles
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: A revision of the adult cestodes of cattle, sheep and allied animals ... / by C.W. Stiles ... and Albert Hassall. Source: Wellcome Collection.

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    87 (G) Moniezia trigonophora sp. n., 1803. (Plate-s VIII. IX.) Symm,my.-Ta-ma expmea Curtice, ex parte, specimens in the collection of the Bureau of Animal Industry. 7. expansa MeM urm-h, see p. 30. 1. Benedtm Neu maun, ex parte. Host— Sheep (Neumann, Curtice, McMurricli, Stiles, Hassall). Geographical distribution.— North America: U. S. A., Washington, D. C. (Curtice, Stiles, Hassall); Blairsville, Pa. (Stiles); Canada (McMurncli). 11mice (Neumann). LITERATURE. McMuitRicii. See above, M. expansa, p. 27. S'Iiles. Notes sur les Parasites—14: Sur le Tania expansa End.; Compt. rend. d. 1. Soc. d. Biol., Paris, 1892, p. 165. (T. Benedeni de Neumann.) Bemerkungen iiber Parasiten—17: Ueber die topograpbische Anatomie des Getiisssystems in der Familie Tceniadw; Centralblatt t. Bakt. u. Par., 1893, bd. xiii, p. 465. HISTORICAL REVIEW. McMurricli (1) mentions a tapeworm epizootic in Canada, and diag- noses the parasite as Taenia expansa. From his figures and description, however, we suspect that the worms belong to this new species.* In September, 1891, Stiles received instructions from Hon. Edwin Will its, Acting Secretary of Agriculture, to proceed to Blairsville, Pa., and study an epizootic among sheep, which was reported as existing at that place. He found that the sheep were infested with a large number of worms, which were undoubtedly the cause of the trouble. Strongylns eontortus was present in the fourth stomach in such numbers that it was almost impossible to see the mucous membrane. Besides this, all of the slice]) examined contained large numbers (10-dO) of tapeworms belonging to the species here described. Upon comparing these worms with parasites in the Bureau collection it was found that Curtice had collected a number of the same kind from sheep slaughtered at Wash- ington, 1). 0., and had determined them ns Ta nia expansa. As stated above, Neumann’s specimen of M. Benedeni also agrees with this form. ANATOMY. General appearance.—The worms are of a cream color when fresh. The head is quite small; the strobila attains the length of about 1.0 meters. The segments are very sharply defined, in nearly all cases broader than long, although some segments were found which were almost square, or even longer than broad. The largest segments are generally 0-7n,m broad by 2mm long. Scolex.—The head (Plate vm, Figs. 2-2c) in preserved specimens measures 0.024-0.704 broad; in a balsam-preparation of the same form * Through the kindness of Prof. McMurricli 1 have been able to examine the worm mentioned by him as T. expansa, and have verified the interpretation given above. There is no doubt that the worm is identical with M. trigonophora.—c. w. s.