348 HYDATIDS OF THE LIVER IN ANIMALS. 



HYDATIDS OF THE LIVER IN ANIMALS, CYSTICERCUS TENUI- 

 COLLIS. T^NIA MARGINATA IN THE DOG AND WOLF. 



The pigs in Ireland, and both cattle and sheep throughout 

 the United Kingdom, suffer to a very great extent from 

 hydatids in their livers. Amongst these cystic parasites we 

 find a large number of the species Cysticercus tenuicollis. 

 These cysticerci are apt to take up their abode also in the 

 internal organs of man, and it is probable that they often 

 lead to the development of cysts supposed to have been due 

 to the presence of echinococchi, and I am inclined to attri- 

 bute to this parasite the cystic tumours which Dr Brinton, 

 and even Dr Gairdner, consider arise in human beings eat- 

 ing raw or underdone animal food. Human beings suffer 

 from these cysticerci under circumstances similar to those 

 which lead to the development of cysticercus cellulosse, and 

 which I have before alluded to. 



There is no doubt that eggs of the tapeworm developed 

 from cysticercus tenuicollis in the intestines of the dog, will 

 develope into hydatids in the mesentery and liver of human 

 beings, as it does, according to the experiments of Luschka, 

 Leuckart, and others, in the organs of the domestic quad- 

 rupeds. 



It is of the greatest importance that careful and extended 

 inquiries should be made as to the prevalence of these cysti- 

 cerci in animals. It is evident, from the observations of 

 Kuchenmeister and others, that many individuals of these 

 species, forming extensive cystic tumours, are to be found in 

 pigs, and not unfrequently there has been a confusion 

 between cysticerci and echinococchi. Thus, in Ireland, the 

 endemic cystic disease appears to be due to both these 

 hydatids. 



