CTSTICEBCUS CELLULOSM, AS TOXIND IN THE MUSCLES OF THE PIG. 125 
portae. At first they were very small white bodies having none of the marks of Cysticerd ; 
they afterwards enlarged, assumed an oblong shape, and, piercing through the substance 
of the liver, escaped into the peritoneal cavity ; then, in a thickening which appeared at 
the fore-part of the very simple vermiform body, was developed the characteristic head 
of the Cysticercus with its suctorial disks and circlet of hooks. No trace of the six 
emhryo-hooTcs could be detected in connexion with the Cysticerd. These observations 
of Leuckaet were published in 1855, and were not known to the author when he first 
communicated his researches to the Royal Society in the summer of that year. Allow- 
ing for differences not unlikely to modify the process in different cases, the facts observed 
by Leuckaet are in no way irreconcileable with the conclusions arrived at in this paper ; 
and after due consideration of the present state of knowledge concernuig the relations 
subsisting between the Tape-worm and Cysticercus, the author sees no reason to distrust 
the evidence on which he has represented the Cysticercus cellulosce as immediately deve- 
loped from a peculiar vermiform animal, whatever be the mode in which the latter may 
be derived from a Ifema-embryo. 
Finally, the facts made known in this communication may perhaps serve to throw 
light on the nature of certain bodies of an ambiguous description observed by Von Hess- 
LiNG* to be occasionally present in the muscular tissue of the heart of the Ox, Sheep, 
and Roe Deer. These objects appear under the form of oval aggregations of granules of 
a peculiar kind, enclosed in an outer capsule and parted into several smaller masses some- 
what like the segments of a yelk in the process of division. Without hazarding an 
opinion as to their destination. Von Hessling compares these bodies to the elongated 
tubular capsules filled with similar spore-like granules, which were discovered in the 
abdominal muscles of mice by Miescher, and subsequently in rats by Bischoff and 
SiEBOLD. These singular formations are described by the last-named observers as being 
lodged within the sarcolemma of the muscular fibre. Siebold is inclined to regard them 
as vegetable parasites ; but they offer many points of resemblance to the early condition 
of the Cysticercus as described in the foregoing pages. 
Description of the Plates. 
PLATE X. 
Fig. 1. A Cysticercus with its neck protruded. 
a. The ventral part. 
b. The neck. 
Fig. 2. The free quadrilateral surface at the extremity of the neck, showing the four 
suctorial disks at its angles, and the ring of booklets at its centre. 
Fig. 3. The two sets of fibres, longitudinal and transverse, visible in the membrane of 
the neck of the Cysticercus, also the laminated calcareous particles. 
* Zeitachriffc fiir Wissenschaftliche Zoologie, vol. v. p. 196. 
S 
MDCCCLVII. 
