128 



ENTOZOA. 



mucli in size, and also in respect of the position and form of tlieir 

 reproductive organs. In the more typical forms the segments are 

 broad and narrow, having their reproductive outlets, side by side, 

 at or near the centre of each joint ; but other types display square- 

 shaped and oblong segments, having their reproductive outlets at 

 the lateral margins. 



Structure and Development. — As a lengthened account will 



Fig. 29.— Pai't of the strobile of JBothriocepJialus proioscideus, Rudolphi ; from the intestine of a 

 Salmon (Salmo salar) ; highly magnified. — Busk. 



hereafter be given respecting the anatomy and reproduction of the 

 great Bothriocephalus infesting man, I shall here confine my 

 remarks to an account of the changes observable in the life of one 

 or two forms infesting the lower animals. And first in regard to 

 the Bothriocephalus nodosus. This species infests herons, gulls, 

 divers, and a great variety of water birds, whilst its larval, or. 



