Report for the year 1911 / Australian Institute of Tropical Medicine ; by Anton Breinl, in collaboration with Frank W. Taylor and T. Harvey Johnson.

  • Australian Institute of Tropical Medicine.
Date:
[1912]
Catalogue details

Licence: In copyright

Credit: Report for the year 1911 / Australian Institute of Tropical Medicine ; by Anton Breinl, in collaboration with Frank W. Taylor and T. Harvey Johnson. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    13. 11 ij me Hole pis megalops (Nitzsch), Parona. A few cestodes collected from the intestine of the pied goose, Anseranas senii- palniata Lath., belong to the above-mentioned widely distributed species, whose occurrence in Queensland is now definitely recorded for the first time. Krefft (1871, p. 220), described a tapeworm. Taenia cylindrica Krefft (nec Clerc), from the black duck, Atias superciliosa, but an examination of his original material (Johnston, 1912, p. 33), has shown the species to be identical with Hymenolepis megalops, which is now known to infest several Australian anseriform birds. 14. Hymenolepis terraereginae, n.sp. (Plate xvi., Figs. 25-26.) In company with H. megalops, there were taken from Anseranas semipalmata, numerous delicate scolexless tapeworms 20 to 30 mm. long, whose anatomy, in so far as the poorly-preserved fragmentary material has allowed comparison, closely resembles that of H. collaris (syn. H. sinuosa). Th(.' Hulcriur segments are small, there being a gradual increase m their dimensions until a breadth of about A mm. is reached. The genital pore lies in the anterior third of the proglottid edge. The transverse ventral excretory vessels have a much wider lumen than the dorsal vessel. The sex ducts pass above both longitudinal canals. The musculature is weakly developed. The cortex contains numerous calcareous corpuscles. The three testes, whose diameter is about .045 mm., lie dorsally in the mid- region of the segment, their relative positions being indicated by the figure. The vas deferens is at first a coiled tube lying in the anterior aporal corner, inwardly from the accessory sacculus. Within the long thin-walled cirrus-sac the male duct becomes swollen to form a large vesicula^ occupying the inner portion of the sac. Prom the outer end of the vesicula there passes away the long loosely-coiled cirrus, which is frequently bent upon itself. The outer portion of the sac is long, tubular, and bent, the inner end being more or less pyriform or fusiform. The everted 3irrus is relatively broad, and may project freely. Lying in the antero-dorsal part of the segment is the large accessory sacculus, whose inner portion contains a mass of radiating muscle in its walls, the outer being thin-walled. It is lined internally by cuticle, which has an appearance suggestive of the presence of numerous small ridges on its surface. The cirrus-sac opens below the sacculus. The ovary is a trilobed gland, situated below the testes on a plane dorsal to the vitellarium, but ventral to the receptaculum seminis and accessory sacculus. The rounded vitellarium lies between and below the posterior pair of ovarian lobes. The vagina may be slightly coiled, and may be enlarged to form a recep- taculum. It crosses above the ovary. The mature uterus is a sac-like structure lying ventrally to the other organs, and extending laterally above the ventral ves- sels into the cortex. The eggs possess two shells, and measure 19-25 micra long by 15-17 micra broad, the size of the embryo being 15 by 11.5 micra.