A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . organs in the proglottid(Fig. 1308) also differs radically from that in the genusTotna. The numerous tests occupy a dorsal positionon both sides of the segment and vas deferens extendsin loops toward the anterior end, terminatmg in amuscular cirrus pouch with a seminal vesicle. Nextthe male genital pore lies the orifice of the vagina REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Cestoda which passos directly posteriari in the median lineand after forming a receptaculu
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . organs in the proglottid(Fig. 1308) also differs radically from that in the genusTotna. The numerous tests occupy a dorsal positionon both sides of the segment and vas deferens extendsin loops toward the anterior end, terminatmg in amuscular cirrus pouch with a seminal vesicle. Nextthe male genital pore lies the orifice of the vagina REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Cestoda which passos directly posteriari in the median lineand after forming a receptaculum seminis joins thecommon yolk duct near the center of the voluminousshell glaiid. The vitellaria or yolk glands are race-mose structures occupying the cortical layer of thesegment in the lateral liclds; their numerous ductsconverge and vdtiniately unite into the common yolkduct noted above. The paired ovaries lie one oneither side of the shell gland in the posterior region ofthe proglottis and the oviduct joines the vagina andyolk duct in the shell gland. From the union ofthese ducts originates a canal which expands and as. Fia. 1343.—Ventral Aspect of Sexually Mature Proglottis of Dibolhriocephalus latus. Showing Female Reprodurtive ) (C/. Fig. 130S.) X 12. (After C the uterus lying in irregular loops ventral to the vasdeferens extends forward to the special uterineorifice, a simple pore in the midventral line a shortdistance behind the common opening of cirrus andvagina. In the last proglottides the uterus is of eggs and the genital glands are atrophied. Development.—Ripe proglottids contain numbers ofbrownish, elliptical eggs in which may be distinguishedthe egg cell surrounded by masses of yolk cells. Theseeggs are discharged abundantly in the feces of thehost. After lying in water several weeks a ciliatedonchosphere (Fig. 1311) is hatched out and .swimsslowly about in the surrounding water. Sometimesthis larva throws off the ciliary coverin
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