109] PROTEOCEPHALIDAE—LA RUE 109 



PROTEOCEPHALUS LONGICOLLIS (Zeder) 

 [Figs. 167-169] 



Specific Diagnosis: Characters of genus. Cestodes of small size. 

 Observed length as much as 20-200-464 mm., breadth 1-2-2.25 mm. 

 Scolex 0.43 mm. broad, length (?). Necls: 0.3 mm. broad by 3.2 mm. 

 long. Suckers circular, 0.12-0.14-0.18-0.19 mm. in diameter. Fifth 

 sucker half as large as others. First proglottids 0.43 mm. long by 0.71 

 mm. broad. Proglottids at end of first third of strobila 0.53 mm. long 

 by 0.99 mm. broad. Posterior proglottids 1.03 mm. long by 0.83 mm. 

 broad. End proglottid triangular. 



Genital pore marginal, irregularly alternating, situated at end of 

 anterior one-fourth of proglottid. Testes spheroidal, 0.09 mm. in diam- 

 eter, 25 in each segment, arranged in two( ?) fields near vitellaria. Vas 

 deferens forming a close mass in the median field of proglottid. Cir- 

 rus-pouch spindle-shaped, muscular, 0.110 mm. broad, extending just 

 through vitellaria. Cirrus club-shaped when everted, reaching 0.2 mm. 

 past margin of segment. Ovary bilobed, posterior. Lobes slender, 

 united by a midpiece. Vitellaria lateral, follicular. Uterus with three 

 lateral pouches on either side. Vagina anterior to cirrus-pouch, not 

 crossing same. Sphincter vaginae? Receptaculum seminis? Unripe 

 eggs 0.0156-0.0196 mm. in diameter. 



