CESTOIDEA. 



27 



Tie. 5.' 



Genus Bothriocephalus {Dihothrius, Rudolphi). 



The worms included in this 

 genus have a soft, flattened, and 

 elongated body, which is composed 

 of numerous rings ; the head is 

 oblong, and marked with two lateral 

 depressions, running longitudinally, 

 but it is not armed with any hooks ; 

 the proglottides remain united. 



This genus comprises a large 

 number of species, nearly all of which 

 live in fishes ; the other species, which 

 are few in number, and have been 

 found in the mammiferse and in 

 birds, are but little known, with the exception of 

 the species which exist in man. 



The bothriocephali live in the intestinal canal. 



The Bothriocephalus latus (found iii man). 



This worm is from twenty feet to as many yards 

 in length, filiform in front, and sometimes an inch 

 broad posteriorly ; it is usually of a deepish-red 

 colour ; its head is oblong, and possesses two lateral 

 elongated suckers ; the neck is almost wanting ; the 

 first rings present a wrinkled appearance, those which 

 come next are short and imperfectly square, and 

 those which are situated still more posteriorly, mea- 

 sure more in the transverse, than in the longitudinal. 



^ Fig. 5, i and h. — Head of the Bothriocephalus latus, enlarged 

 six times and seen in two different positions, k, transverse sec- 

 tion of the head of the bothriocephalus found in the turbot, 

 magnified twelve times ; this is introduced into the figure for the 

 purpose of showing the arrangement of the lateral suckers. 



