. The biology of the protozoa. Protozoa; Protozoa. 234 BIOLOGY OF THE PROTOZOA pass with the ingested food into the stomach (mid-gut) of the insect. In this part they multiply actively in a peculiar manner, not as yet described in the case of any other trypanosome in its invertebrate host; they penetrate into the cells of the epithelium, and in that situation they grow to a very large size, retaining their flagellum. Fig. 122. — Trypanosoma lewisi. Cycle in the rat-flea Ceratophyllus fasciatus. 1, 2, blood trypanosomes entering the stomach; 3, 4, entering epithelial cells; 6-10, intracellular
. The biology of the protozoa. Protozoa; Protozoa. 234 BIOLOGY OF THE PROTOZOA pass with the ingested food into the stomach (mid-gut) of the insect. In this part they multiply actively in a peculiar manner, not as yet described in the case of any other trypanosome in its invertebrate host; they penetrate into the cells of the epithelium, and in that situation they grow to a very large size, retaining their flagellum. Fig. 122. — Trypanosoma lewisi. Cycle in the rat-flea Ceratophyllus fasciatus. 1, 2, blood trypanosomes entering the stomach; 3, 4, entering epithelial cells; 6-10, intracellular somatella formation; 11, 12, adult trypanosomes leaving cell; N, young trypanosomes repeating intracellular phase; C, Crithidial forms; H, haptomonads reproducing by division. (After Minchin and Thompson.) and undulating membrane, and exhibiting active metabolic changes in the form of the body, which in early stages of the growth is doubled on itself in the hinder region, thus becoming pear-shaped or like a tadpole in form, but later is more block-like or rounded. During growth the nuclei multiply, and the body when full-grown approaches a spherical form, and becomes divided up within its. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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