. A manual of zoology. Zoology. 254 TLATIIELMINTIIES (fig. 225). Immature and mature stages in lishcs. Tclrarhyiichus,^ Ryncho- bolhrill})!.''' Family 4. TETR.\ Head with four vcr)- mobile suckers, often armed wilh I'looks. Echinobolhriuni:' Aiaii/hoho/liriiiiii/' Family 5 Scolex anil progloltids present; liead spalulale, with two sucking groo\es on the narrower sides. Bo/hrioicplia/iis la/US'^ (fig. 234), the largest tapeN\orm in the human intes- tine (,also dogs and cats), mav reach a length of forty feet anil consist of oxer iouv thousand progloltids. As said a
. A manual of zoology. Zoology. 254 TLATIIELMINTIIES (fig. 225). Immature and mature stages in lishcs. Tclrarhyiichus,^ Ryncho- bolhrill})!.''' Family 4. TETR.\ Head with four vcr)- mobile suckers, often armed wilh I'looks. Echinobolhriuni:' Aiaii/hoho/liriiiiii/' Family 5 Scolex anil progloltids present; liead spalulale, with two sucking groo\es on the narrower sides. Bo/hrioicplia/iis la/US'^ (fig. 234), the largest tapeN\orm in the human intes- tine (,also dogs and cats), mav reach a length of forty feet anil consist of oxer iouv thousand progloltids. As said al)o\-e, the pleurocercoid occurs in hshes, and man acipiires the parasite by eating uncooked I'lsli. It is abundant in Russia, I'russia, ancl Switzerland; rare in America. l'"aniily 6. \ A\'ilh scolex and separable progloltiiis; the scolex always bears four suckers and in many a roslelluni \yilh a circle of hooks (fig. 234). In the progloltids the genital )iore occurs usually laterally in the proglotlids, alternating right and left, rarely onl\- on one side. It is rarely doubled in a proglottid. Intermediate stage a cyslicercus or cyslicercoid. The human tapeworms are here subdiyided accordingly as the sexual animal or the C)'sticercus has been found in man. .1. TiCiiicc sexually mature in the human inleslinc. Most noticeable are Tuiiia soliiiiii'^ and T. .s'ij^'/h(1/i7,* the differences between which are shown in fig. 234. In spite of the lack of , the stronger suckers render 7". soi^iiuita more difficult to expel. Tuiiia solium is not rare in the cysticercus stage in man and occurs sometimes in places, like the brain and eyes, where it causes seyere injury. These cases are in part explained by lack of cleanliness in the food, which may contain eggs, but possibly occur through internal infection; pieces of the ^vorm passing the pylorus and entering the stomach, where they are digested, setting the embryos free. Many oilier Ti(-}ii<r, which are commo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
