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

                                surface of about three fourths of a circle in 
extent, so that the passage through a sucker 
from the external surface to the interior 
of the neck is rendered rather tortuous, & 
inclining to a spiral. The external 
opening of this passage varies very much 
in different cysticerci, both in size 
& shape; but it is always smaller than 
the internal one. It is difficult 
if not impossible to demonstrate by 
the microscope alone, the existence 
of a passage through a sucker, however, 
this fact admits of proof from the circum
stance of the carbonic acid, which is 
evolved in the cavity of the neck from the decomposition of the calcareous 
bodies, when these animalcules 
are in acetic acid, being seen under 
the microscope to pass freely through 
the openings in the suckers. In the 
membranous folds of the suckers both 
circular, & radiating fibres are distinctly 
visible, resembling in their general 
characters those in the neck already 
mentioned. See Plate 1. fig: 4. 
The hooklets as before observed, are 
situated in a circle around the centre 
of the square space before described, see 
Plate 1. fig: 2 & 5. They are generally 
twenty-six in number, - thirteen long, 
& as many short, arranged alternately, 
a long and a short one. Occasionally, but 
very rarely, there are more, I have seen 
as many as twenty-nine. The longer 
hooklets