TAENIA MARGINATA. 249 



size and peculiar form of its hooks; it is also a much larger 

 worm, the proglottides nearly equalling those of T, solium. It 

 does not seem possible for the strobila to take up its abode in 

 the human body, because Dr. MoUer's attempts to infest himself 

 with it (by swallowing several specimens of Gysticercus tenuicollis) 

 were unsuccessful. In the larval condition this worm has an 

 unusually wide distribution ; for, in addition to its asserted 

 occasional presence in man, it has likewise been found in various 

 monkeys, in cattle and sheep, in many other ruminants, in horses, 

 in swine, and even in squirrels. The experiments of Klichen- 

 meister, Leuckart, Luschka, and HoU have fully established the 

 fact that these various animals, and ourselves, become infested 

 with the so-called Gysticercus tenuicollis by accidentally swallowing 

 the eggs of T. marginata, or Tcenia ex cysticerco tenuicolli (Kiichen- 

 meister), which is the same thing. The cysticerci occasionally 

 attain an enormous size, as was the case with those I obtained 

 from the Wart and Hed River Hogs which died at the Zoological 

 Society's Gardens in 1859 and 1860, and which I at first supposed 

 to be referable to two hitherto unknown tapeworms (" Proceedings 

 of Zoological Society," March 12, 1861). Leuckart, however, to 

 whom I forwarded one of the specimens, has corrected me in this 

 matter. In one, the caudal vesicle was pyriform and about fi.ve 

 inches in length ; in another it had the size and form of a cricket- 

 baU. 



The principal evidence, which we have, as to the occurrence of 

 the larval condition {Gysticercus tenuicollis) of this tapeworm 

 within the human body, rests on two cases recorded in Schleiss- 

 ner's " Nosography of Iceland." One of these cases, however, 

 has been proved by Klichenmeister, and also by Eschricht's finend 

 and pupil, Dr. Krabbe, to be that of an echinococcus ; so that, 

 after all, there only remains the solitary case, observed by Schleiss- 

 ner himself, in which this parasite can, with any degree of 

 certainty, be regarded as a true Gysticercus tenuicollis. 



As the definitive solution of several interesting questions 



K K 



