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

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                                as being most characteristic; also some parts 
of a handle can be distinguished, lastly the 
larger pieces, formed obviously by the coalescence 
of smaller ones, can be seen fused as it were 
together, in which frequently the joining is so 
incomplete as to amount to little more than 
mere apposition of the particles. See Plate 4. 
fig 9 & 12.
The part first formed is the hook; this has at first its internal cavity rather larger 
than that in the other ones, & there is an irregularity of its outline indicating a want 
of complete union of its component particles. 
The handle is formed next; this is more re-
markable for its want of symmetry than the 
curved part. Some pieces of it appearing to 
be merely applied to another. See Plate 4. fig 9 & 12. 
Lastly the tubercles are added. Neither the whole 
nor the parts of a hooklet undergo any increase 
in size after being once formed, but on the 
contrary rather suffer a slight diminution. 
The hooklets of the old Cysticercus are frequently 
smaller than those of the young ones. 
But these organs vary a little in different 
animalcules, being rather smaller in some 
than in others, but those  belonging to the 
same individual are remarkably regular 
in this respect.
From the facts that have just been men=
tioned, the hooklets of the animalcule in 
question do not appear to be formed according 
to the plan of cell-development discovered 

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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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