260 ENTOZOA. 



of this chapter, I hinted that all the known Echinococcus forms 

 were reducible to one specific type; or, in other words, were 

 referable to a single species of tapeworm, and not to two separate 

 Tcenice, as Kiichenmeister had led us to suppose. Leuckart 

 was the first to demonstrate the correctness of this view ; 

 but the opinion that the Echinococci were all of one kind was 

 long previously entertained by several observers, and among 

 others, by a no less eminent authority than Livois, who, in 

 his "Recherches sur les Echinocoques, chez I'Homme et chez les 

 Animaux," states that he could recognize no distinction of species. 

 As the literature of tliis subject is both extensive and curious, I 

 subjoin a Kst of the various synonyms under which hydatids have 

 been described, together with a few of the names of the authors 

 by whom these technical terms were severally employed : — 



Echinococcus hominis, E,udolphi ; Bremser ; Chiaje ; etc. 



U. veteiinorum, Rudolphi ; Bremser ; Gurlt ; etc. 



E. scolicvpariens, Kiichenmeister. 



E. altricipariens, Kiichenmeister. 



E. polymorphus, Diesing, Leidy. 



E. granulosus, Rudolphi. 



E. simice, Eudolphi. 



E. hydatidosus, Leuckart. 



E. giraffce, Gervais. 



Polycephalus hominis^ Goeze ; Jordens. 



P. humanus, Zeder. 



P. granulosus, Zeder; Cloquet. 



P. echinococcus, Zeder ; Tschudi. 



Acephalocystis, Laennec ; Diesing ; Dujardin ; Nitzsch ; etc. 



A. ovoidea, Laennec ; Cloquet ; Deslongchamps ; Chiaje. 



A. granulosa, Laennec ; Cloquet ; etc. 



A. surculigera, Laennec ; etc. 



A. endogena, John Hunter ; Owen. 



A. exogena, Kuhl. 



A. rnacaci, Cobbold. 



