66 



of the worm. The partially digested body and caudal 

 vesicle now become detached from the head and neck ; 

 and it is often seen, within the first twenty-four hours, 

 that the adhering scolex bears behind it the middle 

 body and the caudal vesicle on a fine filament, i.e., 

 a rudimentary transverse fold or so-called segment 

 (Kiichenmeister). All that is left of the scolex, 

 therefore, is the head and neck, and this filament. 

 This latter, in process of time (about two days ; Kiich- 

 enmeister), likewise becomes detached, and its site is 

 marked by a cicatricial notch. This notch, according 

 to Leuckart, leads into a cylindrical cavity, passing 

 through the whole body as far as the rostellum ; its 

 walls grow greatly, by which means the scolex is con- 

 verted into a solid and not inflated body. After a 

 varying period, the segments begin to be formed, and 

 the worm has then arrived at its adult state. (For 

 the time at which the sexual organs are formed, and 

 at which the Taenia becomes perfect, I refer the reader 

 to the first portion of this essay.) 



In the preceding, it has been supposed that the 

 scolex had arrived at an intestine favorable for its 

 development. Should the opposite be the case, the 

 process goes on as far as the segmentation : beyond 

 that point, all the growth consists in an inarticulate 

 tail-like appendage (Kiichenmeister). 



The formation of the proglottides or segments is 

 always from the neck downwards, by a budding forth 

 from the body, without sexual propagation ; and this 

 becomes constricted into segments by transverse fur- 

 rows or wrinkles. It therefore follows, that the older 



