The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . four suckers, passbackwards: tuo of th?se gradually disappear, leaving two whichpursue their course down the proglottides, in connexion withwhich they will be again alluded to, and open at the hinderextrcmitv of the worm by a common pore The nervous systemof tlie Cestodea was long, sought in vain: although eome earlyihvestigaters described a ganglion, they were unable to give a
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . four suckers, passbackwards: tuo of th?se gradually disappear, leaving two whichpursue their course down the proglottides, in connexion withwhich they will be again alluded to, and open at the hinderextrcmitv of the worm by a common pore The nervous systemof tlie Cestodea was long, sought in vain: although eome earlyihvestigaters described a ganglion, they were unable to give anyRatikfactorx. proof of its existence, this having been first furnished^ SchaeiJer. It •e«ina generHlly to consist of & ceatrai ganglioD lying within the head, fnjffi -tiiiich tw<j cords [rrocwd backwards,these were regarded by Sommer and Landois as part of the ali-mentary system. Niemiec (5) has recently given a detailed accountof its structure in several different species, andits relations havebeen discussed by Lang (7). The proglottides arise by a species of budding in the narrowneck which immediately succeeds the head; they are separatedfrom each other by groove^ which are- at first so shallow and. Flc. I. —Anatomy of Txnia (frnm Leuckan). A, Portions ol Titnia iaymniaX i. B. head o( the sainu . x 8. C. lieaJ of T. toliutn showmt; uie ciown olhooks, X 22. D. * scRmint of T fagniata. showing ti^c oipansn., nervous syst-ni; ei., IfingituJinai excn-tury tuliti ; tr , . ccniial papilla; cl .cloaca: ^lrl^^I•ouch; vd .\as dcfticns. ( vagina: oo or . ovuriis. sh,g . cluncj, y 7,. yolk gland, r * .rcccptaculumsemiois. «r. uterus; x 7 E. liiccnnnejiionsof ^bove o t/.. 0 d . ovirtucts ,/, feitilizmi; ; x 3i K. drrnclitd scgmtnlol ^inflfo. showing rlicuterua; X / maginfled. indistinct that it is impossible to say with certamty where thesegmentati
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