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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    of theapparatus—i. e., tliat part directly surrounding the embryo—meas- ures 20 ,u in diameter. The liorns are 24// long, appear to be hollow, and end in a disk 15// in diameter. When viewed en face the disk is nearly round. In the center are seen the ends of the two horns, each 3// in diameter, and several—generally four—round nuclear bodies (3//), each containing one or two very refringent dots. These four bodies have every appearance of being true nuclei. When treated with caustic soda the disk frequently assumed the fringed appearance which Curtice figures in Taenia expansa. There is a thin membrane inside the bulb of the pyriform apparatus, aud at a point near the horns this membrane was invaginated toward the embryo (Plate n, Fig. fi). This observation was made upon pre- served material, so that it is not impossible that this is to be explained by a contraction of the embryo. The horns are surrounded by a gran- ular fatty substance. SPECIFIC DIAGNOSIS. From the above anatomical description we feel justified in giving the following specific diagnosis: Moniezia pianissimo, S. & H., 1892.—Adult strobila 1 to 2m long; yellowish. Head quadrate, 0.4-0.9mm broad; suckers at the four corners and directed forwards (diam- eter 0.25nim); dorsal and ventral surfaces usually show a distinct plane running across the suckers and ending about 0.5mm from the anterior extremity (balsam prepa- rations). Neck broad, 0.6-1.5mtn long or very narrow and long. First traces of genital organs 7-12mm from the head (segment ca. 150). The segments are at first extremely short; always much broader than long and louger than thick; ripe seg- ments 12-26mm broad by l-1.75mm long, generally thin. Interproglottidal glands linear, large and very distinct. Genital pores double, situated in the anterior portion of the lateral margin; vagina and cirrus on the same transverse plane—on the right, vagina ventral, cirrus dorsal; left side vagina dorsal, cirrus ventral; gen- ital canals pass dorsally of the longitudinal canals and nerves. Testicles begin about 10cmfrom the head, at first arranged in two triangles; 400-000 testicles present in ripe segments and generally as numerous in the median line as elsewhere, so that the testicles of each side cannot always be distinctly separated. Uterine folds enter the lateral fields. Eggs 63 // in diameter; bulb of pyriform apparatus 20 //; horns 24 //; embryo 16-18 //; hooks 9 //. (See also generic diagnosis, p.54). Type specimen is in the Bureau of Animal Industry; typical speci- mens will be sent to museums* and specialists exchanging’ with this Bureau. s. & n. (2) Moniezia Benedeni (Moniez, 1879) R. Bl., 1891. [Plate II, Figs. 7,8.] Synonymy.—Taenia Benedeni Moniez, 1879; Moniezia Benedeni (M.) R. Bl., 1891; Taenia denticulata Neumann, 1892 (fig. of scolex.) Hosts.—Domestic sheep (Oris aries), Moniez; cattle (Bos Iannis), Moniez, v. Maren- zeller. Geographical distribution.—France (at Lille, Moniez); Austria (at Vienna, v. Mar- enzeller).