. A manual of zoology. Zoology. /fii'i^is. Fig. 246.~Development of Bothriocephalus latiis. (From Leuckart.) A, ciliated larva; B, same witll escaping six-hooked larva; C, young encysted Bothrio- cephalus. The ciliated envelope is temporary and is cast off like the ciliated coat of the trematode larva. The six-hooked larva in some unknown way enters a fish, becomes encysted (pleurocercoid) in muscles or viscera, and changes directly into the head of a Both- riocA'plialus. This on being taken, in feeding, into the intestine of the proper host develops into the adult. The longer and better known
. A manual of zoology. Zoology. /fii'i^is. Fig. 246.~Development of Bothriocephalus latiis. (From Leuckart.) A, ciliated larva; B, same witll escaping six-hooked larva; C, young encysted Bothrio- cephalus. The ciliated envelope is temporary and is cast off like the ciliated coat of the trematode larva. The six-hooked larva in some unknown way enters a fish, becomes encysted (pleurocercoid) in muscles or viscera, and changes directly into the head of a Both- riocA'plialus. This on being taken, in feeding, into the intestine of the proper host develops into the adult. The longer and better known history of the Tcenias differs con- siderably. The distinctions are early recognizable, since the six- hooked larva lacks the ciliated envelope but is enclosed in its homologue, the embryonic shell already alluded to. Since this envelope cannot open of itself, the young must be freed from it by its digestion in the stomach of the proper intermediate host. Thus the eggs of Tcenia solmvi must pass into the stomach of the pig (they are taken by admixture of the food with embryos con- tained in faecal matter) and after being freed from their shell in. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
