83] 



PROTEOCEPHALIDAE — LA RUE 



83 



The following table shows dimensions of neck, head and suckers in 

 millimeters : 



Zschokke's (1884) description, of the head, suckers and neck reads: 



"La tete est petite, distincte du cou, arrondie en-avant. Son pourtour est 

 garni de quatre ventouses dont la position relative est fort variable (see Figs. 

 147-148). 



"Ces organes de fixation sont tres profonds et pourvus d'une puissante mus- 

 culature. Quelquefois ils sont reunis sur une de faces, de maniere qu'on peut 

 les voir de face tous les quatre a la fois. Frequemment elles font saillie au dela 

 des pourtour de la tete. Celle-ci prend alors une forme libee ou frangee fort 

 variable selon le degre de contraction des ventouses. La tete presente ainsi souvent 

 des preeminences distribuees regulierement, Les ventouses peuvent meme aflfecter 

 la forme de petites trompes protractiles. 



"Le cou est long, filiforme, epaissi en-arriere; il n'occupe cependant jamais 

 plus d'un cinquieme ou d'un quart de la longueur totale de I'animal, tandis que 

 chez le Taenia longicollis il atteint facilement un tiers." 



There is pretty good agreement between his description and the 

 writer's. In the writer's specimens the first proglottids are broader 

 than long, 0.20 mm. broad by 0.05 mm. long. These soon elongate 

 somewhat and then the anlagen of the genital organs begin to appear. 

 The proglottids as they become mature elongate and also increase in 

 width. They may be much elongated, nearly square or broader than 

 long depending upon the state of contraction. In the same strobila 

 the following measurements were taken from anterior to posterior some 

 few proglottids being omitted at intervals, measurements of length being 

 stated first in each instance: 1.02 by 0.34 mm.; 0.68 by 0.425 mm.; 

 0.595 by 0.425 mm. ; 0.510 by 0.595 mm. ; 0.595 by 0.680 mm. The last 

 measurement is of the last proglottid without uterine eggs. Ripe pro- 

 glottids may be nearly square, longer than broad or broader than long. 

 They may measure as much as 1.19 long by 0.68 mm. broad; 0.68 by 



^Head turned slightly sideways. 



