38 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[38 



PROTEOCEPHALUS FILICOLLIS (Rudolphi) 



[Figs. 15, 58-60] 



1782: Taenia from Gasterosteus 



1786 : Taenia from Gasterosteus 



1790: Taenia gasterostei 



1800: Alyselminthus gasterostei 



1802: Taenia filicollis 



1803 : Halysis gasterostei 



1810 : Taenia filicollis 



1819 : Taenia filicollis 



1844 : Taenia filicollis 



1845 : Taenia filicollis 



1845: Taenia ambigua 



1850 : Taenia filicollis 



1850 : Taenia ambigua 



1858 : Proteocephalus ambigua 



1858 : Proteocephalus filicollis 



1872: Taenia ambigua 



1889 : Taenia filicollis 



1902 : Taenia filicollis 



1905 : Ichthyotaenia filicollis 



1909: Ichthyotaenia ambigua 



1911 : Proteocephalus filicollis 



Specific Diagnosis: Charactt 

 Jjength as much as 35 mm. or more. Breadth 0.8 mm. Proglottids few, 

 15-25. Segmentation indistinct. Proglottids attached by their full 

 width. First proglottids broader than long, 0.20 mm. broad by 0.075- 

 0.080 mm. long. Mature proglottids about 0.18 mm. long by 0.370 mm. 

 broad. Ripe proglottids 0.48-0.66 mm. long by 0.425 mm. broad. Head 

 small, 0.090-0.120 mm. broad or perhaps a little more, not always well 

 set off from neck. Suckers 0.042-0.055 mm. in diameter. No fifth 

 sucker present. Neck to first traces of segmentation about 1.0 mm. long. 



Genital organs as in genus. Genital sinus marginal, irregularly 

 alternating, situated near middle of segment on a papilla-form promi- 

 nence. Cirrus-pouch about 0.130 mm. long by 0.032-0.040 mm. broad, 

 reaching about y^-% across the breadth of the proglottid. Cirrus-canal 

 much coiled in cirrus-pouch. Vas deferens forming mass of eccentric 

 coils. Testes in two layers, about 75-90 in all. Vagina anterior to 

 cirrus-pouch. Sphincter vaginae weakly developed. Receptaculum 

 seminis present. ViteUaria made up of quite compact follicular masses, 

 in lateral fields. Ovary bilobed, connected by an arched mid-piece. 



