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

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                                hooklets are about 1/150th of an inch in length, 
the shorter ones are a little less. Each con=
sists of a curved part resembling a bird’s 
claw, & a straight part or handle; and 
at the junction of these two parts there 
are rounded processes, or tubercles, two 
in the short hooklets, & only one in the 
long ones, an anatomical mark by 
which the two kinds can be easily 
distinguished. See Plate 1: fig. 6 (b) & (c). 
They are composed of a very highly re 
fractive, dense & perfectly homogeneous 
substance possessed of a slight degree 
of elasticity & not acted upon by acetic 
acid. In the curved portion there is 
a cavity filled with a fibrous material, 
the other parts are perfectly solid. They are 
placed (see Plate 1, fig: 5.) like the radii 
of a circle with the extremities of their 
handles turned towards its centre, which 
corresponds to the centre of the quadrangu
lar area in which they are situated, & their 
handles not meeting at this point circum
scribe a small circular space which 
if perforated, would correspond to the mouth 
of the animalcule, but at this part 
there is no opening. The membrane 
is simply depressed so as to present a 
conical hollow. By pressure upon the 
neck this part can be made to protrude 
in the form of a tongue-like process. 
The handles of the hooklets are connected 
with this process so that when it moves 
they must move with it. (See Plate 1, fig: 7a). 
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George Rainey
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On the Structure and Development of the Cysticercus cellulosae, as Found in the Pig, by George Rainey, 1857. From The Royal Society, PT/56/8



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