upon the Struciure and Oeconomy of. Tania. 259 
The-different vafcular ftru&ures were in moft inftances injected, 
and often difleted, to fhew more clearly the arrangement of thofe 
veffels. ‘ | 
The parts are in general reprefented of the bignefs which they 
appear to the naked eye, when contained in bottles of fine fpirit. 
The heads are in moft cafes drawn from views through a magni- 
fying glafs. Reprefentations of the heads and ftruéture of other 
fpecies are given by way of illuftration; and the Fafċiola hepatica, 
fig. 17, is exhibited to fhew the great affinity (in ftructure) be- 
tween that and Tenia. ` 
Fig. 1. Shews the head of the Tenia Solium magnified: at its 
upper extremity it forms a circular plane, in the centre of which 
is a round uc reprefented by the dark-fhaded circle; this 
vir „the mouth, which leads by a duét into the lateral or . 
Fea The mouth is furrounded by projecting radii, 
whofe fibres run lengthways. From the extremity downwards there 
is a rounded narrow part which may be called the neck, below 
which it becomes flatted and broad, and two hollowed tubercles 
appear upon each flatted fide; thefe are reprefented by the two 
dark-fhaded fpots. 
Fig. 2. Is the fame head, of its natural bignefs, and which be- 
longed to a Tenia twenty feet in length. | 
Fig. 3. Shews the alimentary canals, in a portion of the fame 
Tenia, of their natural bignefs. The dark-fhaded undulating lines 
are the alimentary canals, which are feen to their full extent in this 
portion of the worm. 
Fig. 4. Shews the middle fy fem of vefiels, in two joints, which 
are reprefented by the dark lines. 
Lla Fig. 5. 
