258 Mr. CARLISLES Ob/érvations 
the vafcular ftru&ure of Tenie to vary exceedingly in the different 
joints of the fame animal: this is a miftake, and arifes from his 
not having injected thofe veffels; but drawn them as they ap- 
pear naturally. In this ftate the vefiels are feldom all filled with 
the coagulated fluid, and thofe which remain empty are invifible: 
thus, in proportion to the number and relative fituations of thofe 
filled canals, the ftruéture will appear different; by injection, 
however, I have found them to vary extremely little in the differ- 
ent joints of the fame animal. 
In another inftance Mr. Goeze appears to be miftaken; he fup- 
pofes the lateral ofcula to be connected by a du& with the middle 
ftructures of veffels. I have found, by repeated careful injections, 
that this never happens. Mr. Goeze feems alío to have taken the 
middle ftru&ures of veffels for ovaria or oviducts, and has accord- 
ingly defcribed the globules in the fluid which they contain as the 
ova: but this fluid being found coagulated after the animal's death 
makes it appear much more of the nature of blood, and, befides, I 
have feen it tinged with bile. In the delineations of the heads of 
Tenia, in Mr. Goeze's book, he has exhibited the fimbriæ placed 
round the mouths as evidently calculated to ferve the purpofe of 
tentacula, in the Tenia Felis particularly. Vide Goeze Eingew, 
pl. 24. fig. 3, 4. 
Explanation of the Figures, TAB. 25. 
THE drawings have been made from fuch portions of the worms 
as appeared beft fuited to illuftrate their ftructure, more efpecially 
the formation and funétions of thofe parts which feemed deftined 
to ferve the purpofes of nourifhing the animal's body, and of pro- 
creation. . 
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The 
