310 DR. T. S, COBBOLD ON HUMAN ENTOZOA.  [Nov. 25, 
Cruveilhier, Curling, Portal, Foster, Thompson, Annesley, Keber, 
Virchow, Aran, Vogel, Lebert, Major, Livois, Thiel, Moquin-Tan- 
don, Davaine, &c. 
E. veterinorum, Rudolphi, Bremser, Blainville, Gurlt, Allessan- 
drini, Owen, Dujardin, Gervais, Leuckart, Huxley, Weinland, &e. 
E. scolicipariens, Kiichenmeister. 
E. altricipariens, Kiichenmeister, Cobbold. 
E.. polymorphus, Diesing, Leidy. 
EF. granulosus, Rudolphi. 
E. simie, Rudolphi. 
LE. giraffe, Gervais. 
Polycephalus hominis, Goeze, Jordens. 
P. humanus, Zeder. 
P. granulosus, Zeder, Cloquet. 
P. echinococcus, Zeder, Tschudi. 
Acephalocystis, Laennec, Diesing, Dujardin, Nitzsch, Siebold, 
Van Beneden, Moquin-Tandon, &c. 
. ovoidea, Laennec, Cloquet, Deslongchamps, Chiaje. 
. granulosa, Laennec, Cloquet, &c. 
. surculigera, Laennec, &c. 
. endogena, John Hunter, Owen. 
. ewogena, Kuhl. 
. macaci, Cobbold. 
A. ovis tragelaphi, Cobbold. 
Vesicaria granulosa, Schrank. 
Hydatigena granulosa, Batsch. 
Hydatis, Liidersen, Rudolphi, Olfers, Bremser, Leuckart, Kiihn, 
Tschudi, Dujardin, Wilson, Rokitansky, Moquin-Tandon, Barker, 
Davaine, &c. 
HI. erratica, Blumenbach. 
Following Kichenmeister, Weinland and others suppose that 
there are two distinct forms of Echinococcus severally referable to 
different Tapeworms, one of which is on all hands admitted to be 
Von Siebold’s Tenia echinococcus, the other an unknown Tenia, 
also supposed to infest dogs. That Eehinococci vary much, both in 
regard to the number of cephalic hooks they display at certain in- 
tervals of growth, and also in respect of the mode of evolution of the 
scoleces, few will deny ; but, according to Leuckart, we are not there- 
fore warranted in accepting Kiichenmeister’s view as to the specific 
distinctness of certain forms. Like others, I had been led away by 
Kiichenmeister’s authority, although I have had abundant opportu- 
nity of investigating these singularly interesting larvee. The grounds 
on which Leuckart disputes Kiichenmeister’s view are, I think, per- 
fectly satisfactory ; for he shows conclusively that the proportional 
number of hooks fluctuates in both forms, whilst the alleged differ- 
ences in the size and character of the hooks themselves have reference 
to their degree of development (‘ Die menschlichen Parasiten,’ p. 328 
et seq.). If this view be generally accepted, it cannot fail to suggest 
important hints as to the best mode of checking that formidable 
RRA RAR 
