. A text-book of agricultural zoology. Zoology, Economic. VARIOUS FORMS OF TAPEWORMS. 53 proUgerous vesicles, and they may break away and float in the fluid contents of the cyst. Secondly, there are formed in the hydatid membrane (ct) cavities {vf), which gradually become larger and pass either in- ternally (vf") or externally {vf); these are secondary or daughter- vesicles. As a rule, we do not find internal and external daughter-vesicles in the same hydatid. These secondary or. Pig. 15.—Diagram showing formation of Peoligerous and Secondahy Vesicles in Echinococous. Railliet. ct, Hydati
. A text-book of agricultural zoology. Zoology, Economic. VARIOUS FORMS OF TAPEWORMS. 53 proUgerous vesicles, and they may break away and float in the fluid contents of the cyst. Secondly, there are formed in the hydatid membrane (ct) cavities {vf), which gradually become larger and pass either in- ternally (vf") or externally {vf); these are secondary or daughter- vesicles. As a rule, we do not find internal and external daughter-vesicles in the same hydatid. These secondary or. Pig. 15.—Diagram showing formation of Peoligerous and Secondahy Vesicles in Echinococous. Railliet. ct, Hydatid membrane; m, germinal vesicle; vp, proligerous vesicles; vf, daughter- vesicle commencing to form; vf, daughter-vesicle passing externally; vf", daughter- vesicle passing internally; vfi, internal daughter - vesicle; vfe, external daughter- vesicle ; vpfi, internal grand-daughter-vesicle; vpfe, external grand-daugbter-vesicle. (From Par. Dis. Ani., Neumann.) daughter-vesicles may produce proligerous vesicles, and thus scolices, internally (vfe). Some do not produce scoHces but other vesicles, grand-daughter-vesicles {vpfi and vpfe). These grand-daughter-vesicles may again form internal proligerous vesicles, and thus scolices; or they may remain as acephalocysts, just as the primary proligerous vesicle does occasionally. O will thus be seen that one ovum of Tcenia echinococcus may. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
