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

                                is an accurate representation of one of 
these animals folded up in its cyst. This 
measures as it is thus folded up 1/16 of an inch 
in length.
Plate 4, Fig: 1. shews a Cysticercus re=
moved from its adventitious cyst. It has 
still somewhat of the folded character of the 
preceding specimen. This is 1/7 of an inch 
in length, & 1/28 in breadth. The interior 
of a cyst being smaller than the animal=
cule contained therein, it naturally 
follows, that during its growth, one 
portion must be folded over another. 
By this means it is adapted to the 
confined locality, in which it is lodged 
during the period of its development. 
Hence the ventral portions of all 
Cysticerci are, when first taken from 
their cysts very much plicated, but 
these plicae disappear, the ventral 
sac becoming distended soon after 
a Cysticercus is placed in contact with 
fluid. 
Up to this point of the develop-
ment of the Cysticercus it is a simple 
cyst growing by the assimilation of 
fluid imbibed equally by every 
part of its surface, no one part dif=
fering sensibly in its structure from 
another. No portion of this surface pre=
sents any indication of incipient 
hooklets or suckers. There is nothing 
either on its surface, or in its interior 
analogous to the structure of an 
ovum