Some flagellate forms found in the intestinal tracts of Diptera and other genera / by A. Lingard and E. Jennings.
- Lingard, Alfred.
- Date:
- 1906
Licence: In copyright
Credit: Some flagellate forms found in the intestinal tracts of Diptera and other genera / by A. Lingard and E. Jennings. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![work, while a karyosome or irregular-shaped body may be frequently observed within the nucleus. The flagellate nucleus or blepharoplast, which is smaller and more compact than the former, stains deeply, is most irregular in form, oval, circular, kidney, or trefoil shaped. The structure of the blepharoplast can also be made out in specimens which have been subjected to pressure, and the karyosome may then be recognised. The flagellate apparatus of the Herpetomonas is a marked feature ; it stains a deep or purplish-red with Romanowsky and the modifications thereof. In structure it may be likened to a long Australian stock- whip with two lashes intimately blended, and a small leather loop which encircles the wrist when in use. The lashes represent the flagella, the knots connecting the stock the diplosomes, the rigid whip- stock the rhizoplast, the posterior end of which, running back towards the blepharoplast, is connected to that nucleus by the loop which encircles the wrist. In some specimens the latter may be observed as two fine pink lines, the intermediate protoplasm, if ]3resent, not taking the stain. In some few instances, a small button-like formation as described by Prowazek lying on one side of the blepharoplast has been observed, but in the great majority of organisms examined no such body could be discovered. It would appear, however, that the double filament which proceeds to the further end of the organism, finally terminating in a bipolar granule, is connected anteriorly with the ends of the two rhizoplasts (vide Plate IV, A 9), and that the filament or filaments when running to the .posterior extremity of the organism usually lie over or under the nutritive nucleus ; but instances have been observed where the filaments appeared to be in touch with a bipolar granule occupying a position in the nutritive nucleus. The forms assumed during the developmental stages, particularly of the long form of Herpetomonas, in the intestinal tracts of the Diptera, appear to be largely influenced in each case respectively by the degree of pressure the individual members of such colonies are subjected to. As the greatest development occurs in the areas of least resistance, it follows that the forms of some of the parasites are markedly curved and irregular in outline [vide Plate I, C). Coexistent with the Herpetomonas m. d., in the intestinal canal of some Diptera, were observed other forms of flagellate organisms which assume what may be termed flag, rhomboidal, diagonal, and irregular-shaped forms. (a) Flag form.—These organisms present a body and flagellate](https://iiif.wellcomecollection.org/image/b22401179_0010.jp2/full/800%2C/0/default.jpg)
