1862.] DR. T. S. COBBOLD ON HUMAN ENTOZOA, 305 
Vermis vesicularis, Brera. 
Tinna humana, Werner. 
Fesicaria finna suilla, Schrank, Bay. 
V. hygroma humana, Schrauk, Bay. 
V. lobata suilla, Fabricius. 
Now that the organization and mode of development of this species 
is so well understood, it is a matter of regret that the manifest errors 
of earlier writers are not more carefully excluded from our ordinary 
manuals of zoology and comparative anatomy. I allude, for example, 
to such points as the still asserted presence of a mouth and digestive 
canal in Teniade, which cannot be maintained after repeated de- 
monstrations have clearly proved this view to be erroneous. These 
falsely so-called alimentary canals constitute the water-vascular sys- 
tem, and, without entering into minute details, I may here remark, in 
passing, that they do not form tubes of uniform thickness throughout 
their course, but present distinct bulbous enlargements at every joint, 
where the transverse branches are given off. This I have ascertained 
from the careful injection of a fresh Tapeworm recently sent me from 
Brighton by Mr. Murray, F.R.C.S.E. 
In regard to the now well-established discovery of Kiichenmeister 
respecting the development of the common Tapeworm (7’. solium) 
from measly pork, I should not deem it worth while dwelling on the 
subject, did it not unfortunately happen that a few months back 
MM. Pouchet and Verrier gave a general denial to the statements of 
experimental parasitologists respecting the development of Tape- 
worms from Cysticerci, Those who have read the statement, as pre- 
sented in the ‘Comptes Rendus’ (for May 5th, 1862, p. 958), or 
the translation} of it recently given in the July number of the 
‘Annals of Natural History’ (3rd series, vol. x. p. 77 ef seq.), will 
at once perceive the causes which have led these gentlemen to form 
conclusions at variance with the experience of at least nine-tenths of 
the leading helminthologists of the day. As Prof. van Beneden re- 
marks, they err greatly in supposing that any one regards the Ce- 
nurus of the sheep as the larva of Tenia serrata of the dog, seeing 
that nearly all Continental experimentalists, following Kiichenmeister, 
have maintained that the Scoler condition of this last-named Tape- 
worm is unquestionably the Cysticercus pisiformis of hares and rab- 
bits. The researches of Leuckart are especially conclusive on this 
point ; and my own experiments at Edinburgh in 1856 have left no 
doubt in my mind as to the correctness of this view. The negative 
result obtained by MM. Pouchet and Verrier in their last experiment 
(where they fed two dogs each with a hundred heads of Canurus 
cerebralis) certainly seems contradictory as regards the Tenia ce- 
nurus ; whilst, on the other hand, it tends to confirm the correctness 
of our opinion that Cenurus cerebralis and Tenia serrata have no 
genetic relation subsisting between them. I, for one, however, shall 
be glad to repeat these and other similar experiments; and I may 
here also remark that it is of very little use for any one not familiar 
with the species to attempt these inquiries. I strongly suspect, 
Proc. Zoou. Soc,.—1862, No. XX. 
