152 TAPEWORMS OF HARES AND RABBITS— STILES. 



que la poche pt^uiale soit sitiioe oxactemeiit eu son milieu ; le p6nis, qui est tr<'f* long, 

 (li'orit (lone pour sortir une conrlje aceentuoe. I>a saillie que ce derniev ori!,ane pent 

 faire en dehors est considerable. 



Le developpement de la poclie peniale iniprinio des raodilications particuliires a la 

 forme de cet animal. I>a poclie peniale occnpe d'abord la plus grande partie de 

 ranneau; par suite de la rapiditd de son developpement, qui marche beaucouii plus 

 vito que celui du reste de I'anneau, ello forme, sur le bord, une saillio tres forte qui 

 s'eft'ace a mesure que I'anneau grandit. La synidtrie se trouve ainsi retablie, mais 

 le developpement des u'ufs fait bientot disparaitre completement I'enorme poclie 

 peniale. 



Les forts grossissements permettent de voir les o-uls; dont les caractferes sont 

 ceux des ceufs des Ta-uias inermes [p. 24^!] vrais; leur appareil pyriforme est tns 

 developp<5. Les muscles longitudiiiaux sont gros et forment une zone continue et 

 pen <^paisse. La zone de proliferation est tres etendue et sous-jacente aux ventouses. 



Blaucliaril in 1801 found the same form in Lepns variabUh and 

 determined it as an Anoplocephala. 



Railliet in 1893 transfoned it to liis f^Qww^ A ndry a. 



TJirougli the kindness of Blancliardj 1 obtained a number of his speci- 

 mens upon which the folh)wing details are based: 



The worms attain 10 mm. in lengtli by 2 mm. in breadth. The head 

 is unarmed, nearly square Avhen viewed en fuce^ measuring about 0.78 

 to 0.88 mm. broad; it sits like a knob on the end of the strobila, from 

 which it is sharply defined. Xo rostellum was visible. The four suck- 

 ers are powerful, having- a diameter of nearly 0.1 mm. ^eck absent 

 segmentation beginning immediately back of the head; as many as 28 

 segments are present in some individuals. The anterior segments are 

 much broader than long and somewhat asymmetrical: the posterior 

 segments may measure 2.24 mm. broad by 0.8 mm. long; in some cases 

 they become nearly as long as broad. The genital pores are unilateral 

 and dextral. 



The rei)rt>ductive glands are confined to the anterior third of the 

 worm, while the posterior two-thirds are occupied by the uterus. The 

 genital pore becomes almost or (juite obliterated upon the atrophy 

 of the glands. The testicles are confined entirely to the aporose side 

 of the segment, as is the case with Anoi)locex)hala mamiUana and 

 A. trans^iersaria . 



This parasite is veiy closely allied to ^L mamiUana of the horse. 

 From the descriptions of former authors and from my own studies, I 

 propose the following as a revised specific diagnosis: 



Diagnosis. — Anaplocephala u-imrrosa (IMoniez, 1880), R. Blanchard, 

 1891: Strobila attains 10 mm, in length by 1.5 to 2.25 mm. in breadth, 

 and contains from 10 to 28 segments which are always broader than 

 long; proximal segments often asymmetiical in outline. J^istal seg 

 ments attain about 2.25 mm. broad by 0.8 mm. long, rarely becoming 

 nearly as long as broad. Head unarmed, nearly cuboid, measuring 0.1 

 to 0.88 mm., and sits like a knob on the end of the strobila; rostellum 

 not observed; suckers 0.4 mm. in diameter, prominent, rounded, ojten- 

 ing diagonally forward; posterior lobes absent. Neck absent. Gem 

 tal pores unilateral, dextral. The sexual glands are confined to the 



