684 



DEFINITION 0? BOTITRIOCEPHALUS LATUS. 



and fiat, like, a ribbon, especially towards the sides, while the median 

 portion, which contains the uterus, projects as a sort of pad. The 



Fi&. 357.- 



-Bothriocephalus laius 

 (nat. size). 



Fig. 358. — Head of Boihriocephalus latm. 

 ( X 8.) A, From the flat side ; B, From the 

 margin. 



anterior end of the hody is sometimes much contracted, and is then 

 relatively hroad ; sometimes, however, elongated and thin, or even drawn 

 out into a thread-like neck, so that the head, measuring 2 to 5 mm. in 

 length and 1 mm. in hreadth, is marked off as an elongated swelling. 

 Viewed from the side, the head usually has, during quiescence, the form 

 of a more or less elongated oval, with rounded, or occasionally with some- 

 what pointed, anterior end. A shallow fii.rrow, which extends along the 

 margin of the latter, is continued posteriorly directly into the suctorial 

 groove, ivhich can be traced to the hmder end of the head in the form of 



