ZOOLOGY 



The question whether the proglottides which are cast off 

 one by one by the tapeworm should be regarded as individuals, 

 is one which has given rise to much difference of opinion. 

 The comparison which has been instituted between a single 

 proglottis and the body of a Trematode gives some support to 

 the view that the scolex produces by strobilisation a number 

 of individuals (the proglottides), which in their turn reproduce 

 sexually. If this view be retained, the Taeniidae exhibit a 

 well-marked alternation of generations. 



On the other hand, the nervous, excretory, and to some 

 extent the muscular systems are common to all, and the 

 detached proglottides are not capable of individual life or 



Fig. 69. — Various forms of Tape- Worms. 



A. Taenia echinococcus. X 12. From Leuckart. 



B. Archigetes Sieboldii. x 60. From Leuolcart. 



C. Echinohothrium typus. x 10. From Van Benedeu. 



D. Caryophyllaevs mutaUlis. x about 5. From Carus. 



maintenance. It is true that they are stated to increase in 

 size when separated, but this may be due to imbibition of 

 fluids, and it is doubtful how far it corresponds with growth. 



