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 this subject is both extensive and curious, I 

 subjoin a hst 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, Rudolphi ; Bremser ; Chiaje ; etc. 



E. veterinorum, Rudolphi ; Bremser ; Grurlt ; etc. 



E. scoUcvpariens, Kiichenmeister. 



E. altricipariens, Kiichenmeister. 



E. 'polymorpMis, Diesing, Leidy. 



E. granulosus, Rudolphi. 



E. simice, Rudolphi. 



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. su/rculigera, Laennec ; etc. 



A. endogena, John Hunter ; Owen. 



A. exogena, Kuhl. 



A. macaci, Cobbold. 



