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

                                looking portion, which was so coiled up 
within the oval cyst as to form a spiral 
of about a turn & a half, will be made 
to protrude, & then the animal will present 
a form which will admit of an anatomi
cal division into two parts; namely, a 
ventral portion & a neck, which is the 
usual mode of dividing this entozoon. 
See Plate 1. fig: 1.
The ventral part is in the form of 
an oval cyst about 1/2 of an inch in its 
long diameter. It is composed of an ex 
tremely thin membrane rendered uneven 
on its external surface by minute 
rounded projections, & its internal presents 
a granular appearance, as if covered 
with coarsely pounded glass. It is furnished 
with no visible external opening, & is of the 
same structure every where, excepting 
where it is connected with the neck. Its 
cavity contains fluid in which there is 
amorphous granular matter, & some 
highly refractive particles having an oily 
aspect, also occasionally minute earthy 
particles which effervesce in acid.
No fibres of any kind can be distinguished 
in this membrane either in its natural 
state or when acted upon by acetic 
acid. As this part of the Cysticercus is 
formed first & exists as a perfect mem
branous sac some time prior to the devel
opment & addition of the neck, there can 
be but little doubt, this is the part in the 
perfect animalcule, in which the 
function