19 



PART II. 



JBothriocephalus latus. 



BELONGING to the same order as the previous ento- 

 zoon, the genus Bothriocephalus differs in so many 

 respects from it, as to be worthy of a separate descrip- 

 tion. I have therefore introduced it here, for conve- 

 nience sake, before considering the different species 

 of Teeniee. 



Description. This parasite (PL I. fig. 5), first de- 

 scribed by Bremser, is also articulated, of a bluish 

 white or gray color, of a length varying from 2 to 7 

 metres (6 to 22 feet), and a breadth of from 10 to 

 13 mil. (Moquin-Tandon). 



Its head (PL I. fig. 6) differs largely from that of a 

 Tsenia, being small (about 2 to 2J mil. long), oblong 

 or ellipsoid in shape, and retracted in front (Moquin- 

 Tandon). In the perfect state, it is devoid of hooks, 

 such as are found in the Tsenise ; and its suckers are 

 of a different shape, being lateral pits or depressions 

 upon opposite sides of the head, instead of circular 

 ones (PI. I. fig. 6, A). These depressions are not 

 bounded by any borders. 



As in the Taenia, no mouth has been discovered, 

 although Bremser is of the opinion that it is situated 

 between the two cephalic depressions. Later investi- 



