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

  • Lingard, Alfred.
Date:
1906
Catalogue details

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.

    11/52
    apparatus, the ratio of the length of the former to that of the latter in mature organisms being as 1 to about 4 (11 ’48 p to 45-92 p), total length 57 to 60 p. Each body-cavity contains two nuclei, (a) a nutritive, large, open, and granular, in the centre of which a karyosome may occasionally be made out. The position of this nucleus varies con- siderably in different parasites, but a favourite site is in the posterior extremity of the body-cavity. (6) The second nucleus or blepharoplast is in direct communication with the flagellum, which is double, the two being united as in Herpetomonas in. cl., by a fine membrane. v It exhibits in its different stages of development numerous forms, which always stain a dark red and are sharply defined when stained by Romanowsky. The body-cavity of the organism is filled more or less with protoplasm, which may be evenly distributed throughout, but also collects in irregular patches, so that unstained areas or marked baud forms are not uncommonly met with. The body of the organ- ism is surrounded by a fine limiting membrane or periplast, which stains red and is prolonged visibly for some distance along the flagellate apparatus. In a few instances indications of this delicate structure have been observed in the course of the flagella some- what remote from the body of the organism, so that it may ultimately become blended with the flagella. As in the case of Herpetomonas m. d., this form of organism is furnished with rhizoplasts, cliplosomes and fine filaments connecting the former with the blepharoplast. In addition, a distinct thread can be made out, sometimes single, some- times double, running posteriorly from the flagellate nucleus in the direction of the nutritive nucleus. Instead, however, of proceeding in a direct line to its destination, it proceeds to the posterior limit of the body-cavity, and then curves round to where the large nucleus is centrally placed in the organism. In a few instances the filament appears to occupy the centre of an unstained path, which runs antero-posteriorly, similar to that which was previously noted in the long form of Herpetomonas. Occasionally, also, when such an organism is undergoing division, a broad, protoplasmic band may be observed in direct continuation with the posterior extremity of the ble- pharoplast. This band gradually tapers off until it terminates in a fine point, which lies in direct contact with the enlarged nutritive nucleus. Division in this form of organism is longitudinal. The two nuclei respectively divide, and, as may be observed in Plate IV, B 2, the nutritive nucleus subdivides into eight chromosomes. Further allu- sion will be made to some peculiarities met with in regard to this form later in this paper.