Some flagellate forms found in the intestinal tracts of Diptera and other genera / by A. Lingard and E. Jennings.

  • Lingard, A.
Date:
1906
Catalogue details

Licence: Public Domain Mark

Credit: Some flagellate forms found in the intestinal tracts of Diptera and other genera / by A. Lingard and E. Jennings. Source: Wellcome Collection.

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    of the organism appears to lie directly upon its flagellum, which has become external, free, and markedly undulating. When division of the nucleus takes place (Plate IV, D 12), the flagellum becomes partially or wholly retracted and coiled up in the body-cavity. The movements of this form of organism are also characteristic, for it progresses in the same way as a flat-fish swims, undulating move- ments of the body, passing in a horizontal direction from before backwards. Up to the present it has not been possible to discover any differentiation of the flagellate apparatus, with regard to the presence of rhizoplasts and diplosomes. When agglomerating in rosette form, sixteen (16) individuals have been noted, corresponding with the number of divisions or chromosomes which the nutritive nucleus forms. ‘The flagella in such rosettes are centrally placed, as is observed in Herpetomonas sarcophage and Herpetomonas m. d. It remains to be proved to what species this parasite belongs, perhaps a sub-species of Herpetomonas, but certainly not a trypanosoma following the true type ; or 1t may belong to an entirely new species. It will be interesting to discover whether its mode of agglomerating can be accounted for as in the previously mentioned ones on the supposition of Schaudinn “ that the body-axis primarily is bent back on itself, so that the morphological anterior end lies next to the pos- terior end.’ ‘The immature forms of this parasite are found in spheroid colonies or aggregations (Plate III, F, fig. 4), in which indi- vidual cells he in a superficial layer, in a gelatinous matrix, and in some instances the mass would appear to be surrounded by a very fine hmiting membrane. further, the primary aggregation appears . to show indications of secondary colonies, so that some seven or eight subdivisions or more may be made out. These subdivisions probably form the subsidiary rosettes made up of some sixteen units, which agglomerate with their flagella centrally placed, before finally draw- ing out longitudinally. In Plate ITI, F, fig. 5, is depicted a small detached portion of a colony from such a one as is represented in Fig. 4, but in which the individual immature forms are more developed. This form of parasite may turn out to have pathological interest, for the flagellate of Delhi sore remains to be developed from the pyri- form bodies found, the organism recognised and the particular species named. Certain other flagellate parasites were also discovered in addition to the foregoimg, the most interesting of which have been depicted in the illustrations accompanying this paper. A short description of the chief characteristics of these several forms may now be recorded. (31) Small circular or oval bodies (H 1—5) possessing two nuclei,
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