459] PSEUDOPHYLLIDEA FROM FISHES— COOPER 171 



AMPHICOTYLINAE Liihe 1902 



Scolex with two typical, usually not very deep bothria, which in some 

 forms develop posterior, sucker-like portions. In an isolated case a pseudo- 

 scolex is substituted for the scolex. External segmentation insignificant, at 

 times disappearing thru accessory wrinkling or folding of the surfaces of the 

 proglottides. Opening of cirrus and vaginal marginal, irregularly alternating, 

 with more or less strongly pronounced tendency to unilaterality. Uterus- 

 opening median; uterus-sac always well developed. CoiUng of vas deferens 

 strongly expressed. 



Occurrence: In fishes. 



Type genus: Amphicotyle (Diesing 1864) Ariola 1900, e.p. Luhe 1902. 



ABOTHRIUM van Beneden 1871, char, emend. Liihe 1899 



Scolex not exceptionally elongated, with two powerful but not especially 

 deep bothria. Segmentation in older portions of the strobila usually insigni- 

 ficant on account of superficial wrinkling of the individual proglottides; ripe 

 proglottides essentially broader than long. Longitudinal nerves near the 

 lateral borders, dorsal to the cirrus-sac and vagina. Testes exclusively be- 

 tween the nerve strands. Vitelline foUicles of very irregular shape, in two 

 broad lateral fields, in part at least between the bundles of the longitudinal 

 muscles, the follicles of individual proglottides not especially separated from 

 one another. Ovary scarcely lobed, m.ore or less bean- or kidney-shaped. 

 Shell-gland dorsal to the ovary. Uterus-sac in ripe proglottides occupying 

 the whole of the medullary parenchyma. The openings of the uteri correspond 

 to a more or less prominent m.edian longitudinal furrow of the chain of proglot- 

 tides. 



Type species: A. rugosum (Batsch). 



