On the Structure and Development of the Cysticercus cellulosae, as Found in the Pig, by George Rainey

                                be seen to have been produced by the pointed 
ends of the entozoon. These fibrillae having 
been obviously turned out of their original 
course & some directed to one side, & some 
to the other. See Plate 3. Fig: 1. This ex=
planation receives confirmation from the 
fact of those cysticerci, which commence 
their development in the muscular parietes 
of the heart, being of a different shape from 
those formed elsewhere, although their structure 
in all other respects is precisely the same. 
These cysticerci in the first or vermicular 
stage of their development are very short, 
& thick, & of an oval shape. Their loco=
motive fibres though perfectly demonstrable 
are very short & in many instances im=
perfect. See Plate 2. fig 5.
This difference might have been anti=
cipated considering the close texture of the 
muscular fibres of the heart, the absence 
of any well formed sarcolemma, & the 
shortness of the fibres occasioned by 
their frequent interlacement, all which 
circumstances would materially tend to 
diminish the effect, as well as the ne=
cessity for these fibres, & therefore be 
unfavourable to their longitudinal devel=
opment. After these cysticerci have 
reached the spaces between the muscular 
fibres, their subsequent development is 
the same as in other situations, & 
the perfect animals formed in the heart 
can not be distinguished from those 
formed in other muscles. I may also 
add