85] PROTEOCEPHALIDAE — LA RUE 85 



76, 77). The ovarian lobes in ripe proglottids have a span of 0.425 

 mm. The lobes are heavier and thicker than in P. fallax. The organs 

 of the interovarial space have not been observed. In the lateral fields 

 of the proglottid lie the vitellaria, made up of small loose follicles. 

 Well-filled uteri (Fig, 76) are made up of a median tube and 7-8-10-12 

 or even 14 irregular lateral pouches on either side. The more common 

 number of pouches is 8 or 9. One large ventral uterine pore occurs 

 quite regularly near the middle of the proglottid and a smaller pore 

 can sometimes be found farther anteriad. Uterine eggs have three 

 membranes. An outermost hyaline membrane is variable in size and 

 was not measured. The second membrane is thicker, is granular and 

 more nearly spherical. It has a diameter of 0.042-0.048-0.053 mm. tho 

 its more common dimension is 0.048 mm. An innermost thin membrane 

 immediately invests the embryo. The embryo has a diameter of about 

 0.032 mm. but when elongated it may measure 0.026 by 0.037 mm. or 

 even 0.032 by 0.037 mm. The average measurement is about 0.032 mm. 

 Zschokke's description of the genital organs reads thus: 



"Les orifices genitaux se trouvent au fond d'un bourrelet circulaire, situe au 

 milieu ou un peu au-dessus des bords lateraux. L'alternance de la position a 

 gauche ou a droite est irreguliere. Les cirrhes sont courts, coniques, leurs poches, 

 etroites. Rudolphi parle de ovaria quadrangularia ; en effet le parenchyme est 

 rempli de vesicules, qui, dans les articles jeunes, ont une forme ronde ou ovalaire 

 et deviennent, dans les proglottis plus murs, carrees et anguleuses. En realite ces 

 vesicules sont a I'etat normal pyriformes ; leur aspect carre est le resultat de leur 

 pression reciproque. Du reste ce ne sont pas des ovaries, ce sont des testicules 

 dont chacun presente un petit canal deferent. Tous ces canalicules se reunissent 

 dans un canal excreteur commun. 



"Deja Dujardin, en citant la description de Rudolphi, met, derriere "ovaires 

 opaques, egalement carres", un point d'interrogation et Diesing n' en parle plus. 



"Le vagin est court, il aboutit a une poche seminale assez spacieuse. L'uterus 

 sous forme d'un tube large suit la ligne mediane du proglottis et se rend en 

 decrivant quelques faibles lacets vers le bord posterieur de I'article. La il decrit 

 un noeud de lacets et se divise enfin en deux branches, qui, de leur cote, con- 

 stituent a droite et a gauche une masse d'ovaires lobes ou contournes. Entre les 

 ovaires, touchant le bord posterieur du proglottis, se trouve le glande vitellogene. 

 Des amas glandulaires, peut-etre la continuation directe des vitellogenes, se trou- 

 vent le long des bords lateraux." 



This species is much smaller than P. percae (Miiller). It is most 

 closely related to P. fallax from Coregonus fera. It differs from that 

 species in having regularly a larger number of testes (about twice as 

 many as are found in P. fallax) and these are also larger. In P. fallax 

 the testes are in one layer, in this species in two partial layers. The 

 cirrus-pouch is usually longer than in P. fallax and it is relatively 



