477 
bryos 0,031— 0,0336 mm in diameter. Second egg-membrane 0,036 to 
0,041 mm. 
Kraemer (1892) determined that the smaller cestodes of Coregonus 
fera which he had diagnosed as Taenia filicollis Rud. were the same as 
the somewhat larger cestodes from the same host species which he had 
diagnosed as Taenia ocellata Rud. On this basis he declared that 
Taenia filicollis Rud. was a synonym of 7. ocellata Rud. Kraemer, 
however, was not working on specimens of either of Rudolphi’s species 
but with a species at that time undescribed. I have examined several 
cestodes of Coregonus fera from the Swiss lakes which had been secured 
by Dr. H. B. Ward from Prof. Fritz Zschokke. These have agreed 
in all essential respects with Kraemer’s description and drawings. 
Proteocephalus neglectus noy. spec.: With characters of genus. Head 
not observed. Segmentation evident. Ripe proglottids 0,5 mm long 
X 0,93 mm broad to 0,75 mm long >< 1,53 mm broad. Young and 
mature proglottids not observed. 
Genital pore prominent, near middle of lateral margin, irregularly 
alternating. Normal cirrus-pouch 0,34 mm long. Cirrus and ductus 
ejaculatorius straight. Testes about 75, arranged in a single layer. 
Vagina anterior to cirrus-pouch, crossing middle of latter. Vitel- 
laria compact. Uterus with 7—9 lateral pouches on either side. Em- 
bryos 0,026—0,0265 mm, outer egg-membrane 0,042—0,047 mm in 
diameter. ; 
This new species is based on a few headless fragments secured by 
Dr. H. B. Ward from Prof. Fritz Zschokke. These were labelled 
«Taenia longicollis Rud. aus Forelle». The sexual organs differ consi- 
derably from P. longicollis as described by von Linstow. 
Proteocephalus exiguus nov. spec.: — With characters of genus. 
Strobila short and slender, 9—38 mm long by 0,425—0,8 mm broad. 
Segmentation not evident. Neck slender, 2—10 mm long. Head glo- 
bose, 0,12—0,17 mm broad. Suckers 0,058 mm broad by 0,069 to 
0,085 mm long. Fifth sucker muscular, functional, 0,037— 0,048 mm 
in diameter. 
Genital pore near middle of lateral margin of proglottid, irregularly 
alternating. Cirrus-pouch 0,289—0,34 mm long, reaching to middle 
of proglottid. Cirrus straight, when protruded 0,1 mm long. 
Vagina anterior to cirrus-pouch, crossing latter near middle. 
Vitelline follicles small, not compact. Uterus with 9—14 lateral pouches 
on either side. Embryos 0,019—0,021 mm, second egg-membrane 
0,036-—0,046 mm, outer egg-membrane 0,038—0,060 mm in diameter, 
This new species is based on material collected by Dr. H. B. Ward 
in the course of a biological examination of Lake Michigan for the 
