26 



this also has no neck, but its head sits immediately 

 upon the first segment." And, while speaking of the 

 C. fasciolaris of the mouse, he says, 



" The size of its head agrees perfectly with that 

 of the tapeworm with notched segments, (T. serrata) " 

 (Kiichenmeister). 



That Goeze, moreover, had some idea, that from 

 the C. fasciolaris was produced the T. crassicollis, may 

 be gathered from the following (op. cit., p. 245): 

 "On the 13th March, 1780, I found, in the liver of 

 the mouse, two clear crystal vesicles, in each of which 

 there was a pisiform vesicle, but on this as yet no 

 body. I believe, that, as regards the production and 

 development of this kind of worm, I have surprised 

 Nature in the act. In the interior of the inner vesicle, 

 there was a small white process or body of about 

 1" in length. This was firmly attached by its base 

 to the interior of the vesicle, and the white point at 

 which it was affixed could be seen from the outside. 

 When the vesicle was placed in such a position that 

 the white point to which it was attached was at the 

 bottom, it stood upright, in the interior of the vesicle, 

 like the light in a lantern, reaching about to the 

 middle of the vesicle, so that it was completely sur- 

 rounded by the vesicle." From this it follows : 



" 1. That this was the first stage of growth of the 

 cystic tapeworm in its vesicle. 



" 2. The first thing that comes out of the egg must, 

 therefore, be the caudal vesicle ; and this because the 

 worm must first care for its habitation, and prepare 

 this in proportion to the growth of its caudal vesicle. 



