20 ANIMAL PARASITES. 



like, jointed cystic tape-worm from the liver of the mouse " 

 (i. e., Cystic, fasciolaris), he says, " It has no inarticulated 

 neck at all ; it may elongate itself as much as it likes, but 

 the first segment is immediately attached to the head, &c. 

 The size of its head agrees perfectly with that of the tape- 

 worm with notched segments (T. serrata)." The passage just 

 quoted has been so completely ignored that Von Siebold regarded 

 himself as the person who had called attention to the identity of 

 these two animal forms, which was already known to Pallas and 

 Wepfer even before Goeze's time, and commenced his article, 

 " Ueber die Umwandlung des Cysticercus pisiformis in Tania 

 serrata" (' Zeitschr. fur Wiss. Zool./ iv., 1853), with the words, 

 " As early as the year 1844 I first called attention to the simi- 

 larity of the head of the Cysticercus fasciolaris of rats and mice 

 to that of Tcenia crassicollis," &c. The above passage had fallen 

 into such complete oblivion that others also admitted this priority 

 of Von Siebold's without dispute ; amongst others, Kolliker writes, 

 in 1850, in the report of his travels, to Von Siebold, " Lastly, 

 Thompson, of Glasgow, and his prosector, showed us drawings 

 from which it appears that these savans had also observed the 

 conformity of the Cysticercus of the mouse and the tape-worm of 

 the cat, and that they have arrived at the same result with your- 

 self, without knowing anything of your observations." Goeze's 

 most important contributions, however, are his statements 

 regarding the development of Cysticercus fasciolaris (1. c., p. 245). 

 He says, " 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 V" 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 surrounded by the vesicle. From this 

 it follows 



1. That this was the first stage of growth of the cystic tape- 

 worm in its proper vesicle. 



2. The first thing that coraes out of the egg must therefore be 



