119] PROTEOCEPHALIDAE—LA RUE 119 



Specific Diagnosis: Characters of the genus. Large cestodes 65- 

 600 mm. long by 1.2-2,25 mm. broad. Head large, prominent, swollen, 

 flattened dorsoventrally, without rostellum, without fifth sucker. 

 Breadth of head 0.480-0.600 mm., thickness about 0.300 mm. Suckers 

 circular, prominent, with deep cavities, directed anteriad and outward. 

 Diameter of sucker 0.18-0.20 mm. Neck thick, broad, 2-3 mm. long, 

 wrinkled. First proglottids much broader than long, mature and ripe 

 proglottids almost always broader than long. Maximum length of ripe 

 proglottids 1.0 mm., maximum breadth of same 2.5 mm. Proglottids 

 fleshy, well delimited by deep inter-segmental furrows, corners of seg- 

 ments prominent. End-proglottid rounded posteriorly. In its posterior 

 end a deep indentation. 



Genital pore irregularly alternating, situated near middle of lateral 

 proglottid margin. Vaginal opening dorsal and anterior to opening of 

 cirrus-pouch. Cirrus-pouch and vagina opening into a common genital 

 sinus. Testes large, 0.16 by 0.08 mm., 100-110 in number. Testes in 

 two layers, one occupying the whole dorsal field between vitellaria, 

 completely covering ovary. Vas deferens, an eccentric mass of coils 

 reaching from cirrus-pouch to middle of proglottid. Cirrus-pouch 

 about 0.255 mm. long by 0.085 mm. broad, extending l^-% across pro- 

 glottid breadth. Cirrus short, not heavy. Ductus ejaculatorius describ- 

 ing few or no coils. 



Vaginal opening dorsal and anterior to cirrus-pouch. Sphincter 

 vaginae very weak, situated near vaginal opening. Vagina not crossing 

 cirrus-pouch. Vitellaria lateral, voluminous, follicles large and closely 

 packed together. Ovary bilobed, lobes long, thick, and irregular in 

 outline. Ootype and oocapt present. Uterus in ripe proglottids with 

 3-4 lateral pouches on either side. Uterine pores not observed. Eggs 

 provided with three membranes. Outer membrane hyaline, 0.055 mm., 

 second membrane granular, 0.032 mm., embryo about 0.021 mm. in 

 diameter. 



