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ILLINOIS BIOLOGICAL MONOGRAPHS 



[130 



sucker vestigial and deeply set in the tissue of the head, 0.025 mm. in 

 diameter. Sexual organs as in genus. Genital aperture marginal, near 

 middle of proglottid. Vagina anterior and vaginal opening dorsal to 

 cirrus-pouch. Testes 100-120, irregularly scattered between vitellaria, 

 lying in one or two layers, usually one. Cirrus-pouch short, about 0.16 

 mm. long. Ratio of length of cirrus-pouch to proglottid breadth 1:6- 

 1:8. Uterine pouches 7-11-12-14 on either side. Embryos 0.017-0.019- 

 0.021 mm. in diameter. 



Habitat: In intestine of Anguilla vulgaris (type host), and A. 

 chrysypa Raf. 



Creplin (1825) found this species in the intestine of Anguilla vul- 

 garis at Greifswald. His diagnosis and description are here given: 



"Taenia inacrocephala: T. capite elongato, antice crassiore, osculis globosis 

 anticis, rostello brevissimo obtuso, collo brevi, articulis anterioribus brevibus ob- 

 tusis, sequentibus subquadratis, horum lemniscis marginalibus vage alternis. 



Hab. In intest. Maraenae Anguillae Martio, April, Majo et Junio hanc 

 Taeniam reperi aut singulum aut minima tamen copia. 



Descr. Vermes aliquot lineas usque ad octo pollices longi, majores medio 

 corpore lineam cum quarta vel dimidia ejus parte lati, subdiaphani, albissimi. 



Caput oblongum, antice latius, rostello brevissimo, obtuso instructum, inerme, 

 et quatuor osculis (quorum orificia non vidi) globosis, prominentibus, anticis, 

 instructum. Collum breve, rugosum, cum capite continuum. Articuli antici bre- 

 vissimi, inaequales, obtusi, passim medio constricti, sequentes sensim latitudirie et 

 longitudine crescunt, maximam partem quidem latiores, quam longi manent, de- 



