114 



Since Stiles I only find one further reference (using the Zoological 

 Eecord), by Tempere, in the Micrographe Preparateur, 1904, p. 27, which, 

 however, is evidently only an abstract from Neumann, the illustration 

 given being simply a copy of Neumann's figure of the Scolex. Most of 

 the older literature is inaccessible to me (working in South Africa), and 

 has been quoted from Stiles. 



General Appearance. 



Stilesia centrijiunctata (Rivolta) is macroscopically instantly recognis- 

 able among the parasites of sheep by the following details. It differs 

 from the species of Moniezia and Th.ysanosom.a by its small breadth as 

 compared to its length, the extreme breadth not frequently exceeding 

 3 mm. ; its greatest breadth is usually near the scolex, the posterior 

 portion of the strobila being almost round in section. 



It differs macroscopically from the other species of Stilesia by its 

 greater length, and also in the following particular. The strobila from 

 10 cm. distance from the scolex onwards appears to consist of five longi- 

 tudinal bands, a moderately transparent one laterally on each side, within 

 this a very transparent band on each side, enclosing medially an opaque 

 band. 



The moderately transparent portions are the lateral fields; the very 

 transparent bands are caused by the extremely wide ventral longitudinal 

 canals ; the opaqueness of the median band is caused by the female genitalia 

 and their supporting tissues. 



In life the worm has a gelatinous appearance (except along the median 

 line, which is somewhat opaque) ; it is slightly yellowish or greyish. 



Dimensions. 



Perroncito (quoted from Stiles' " Revision '"') gives the following 

 dimensions : — 



Total length 2-75— 2-84 m. 



Width 10 cm. from scolex 2 — 4 mm., 50 cm. from head 2 — 3 mm. 

 150 cm. from head 1.55 mm., terminally 1 mm. 



Neumann, Traite, second edition, gives approximately the same 

 dimensions. Stiles states the total length to be nearly 3 m., at 10 cm. 

 from head the segments are 2 — 3 mm. wide and grow narrower from here 

 onwards, posterior segments being scarcely 1 mm. wide. Tempere (1904) 

 evidently quotes the length from Neumann or Perroncito, giving it at 

 2-75 m. — 2-85 m., segments 10 cm. from scolex being 2 — 4 mm., at 150 

 cm. from scolex 1 mm. He adds that this worm differs from other 

 Taeniadae in that its segments are widest near the head, 



