131 



Before leaving the uterus, the ova are aheady provided with their shell. 

 They are globular, measuring 24 ^^ to 28 ^ in diameter (from specimen 

 macerated with 10 per cent, potash), and are devoid of projections or 

 spines of any kind. The pockets in which the eggs are finally enclosed, 

 resemble to a very great degree those figured by Lungwitz for Taenia 

 villa {Thysanosoma giardi). 



Influence of Host. 



I have not observed any lesions attributable to the presence of the 

 worm at post-mortems of sheep infested with Stilesia centrifunctata. 

 The suckers are, howevei', often filled with epithelial elements. 



Specific Diagnosis. 



Stilesia centrifunctata (Riv. 1874), Railliet, 1895. Head large, 

 varying from 1 "5 mm. to 3-1 mm. long, by 1-0 mm. to 2-4 mm. broad. 

 Suckers, large, directed diagonally outwards. Strobila from 2 to 3 metres 

 long. Segments 10 cm. from scolex measure from 2 to 3 mm. wide at 

 20 cm. up to 3-2 mm. ; growing narrower posteriorly, the strobila loses 

 its flatness and finally becomes almost round in section, measuring about 

 1 mm. in diameter terminally. The greatest width is often, but not 

 invariably, close to the scolex. Segments are always much thicker than 

 long, and anteriorly much broader then thick. Genital openings 

 irregularly alternate ; uterus transverse in median portion of field, mature 

 ova in egg-pouches arising out of fibrous organ. Testicles extend from 

 a short distance from each end of uterus to almost to the lateral nerve. 

 The genital canals pass dorsally to the nerve and to the dorsal and ventral 

 canals. The vas deferens passes dorsally across the segment, dorsal to 

 lateral canals, nerves, vagina spermiduct, receptacidum seminis, and uterus. 

 The cirrhus is becoming rudimentary, opening directly into the vagina. 

 No vitelline gland nor shell gland. Ova round, without spines or other 

 projections, measuring 24 to 28 i^. Development unknown ; host sheep, 

 Italy and Africa ; habitat in the small intestines. 



