126 
ME. EAINET ON THE STEHCTTJEE AND DEVELOPMENT OP THE 
Fig. 4. A suctorial disk sufficiently magnified to show the circular and radiating 
fibres. 
Fig. 5. The entire number of booklets in situ: — {a) the circular area circumscribed by 
the handles of the booklets ; {h) the external zone of circular fibres ; (c) the 
internal zone ; (e) the radiating fibres placed between the booklets, and con- 
necting them together ; (f) fibres connecting the booklets to the central 
membrane. 
Fig. 6. Three booklets: — (a) one as seen in profile, showing the cuiTed portion and 
the handle, and at their union a tubercle ; (b) one of the larger booklets with 
only one tubercle ; (c) a smaller booklet with two tubercles. 
Fig. 7. The circular depressed part circumscribed by the inner extremities of the handles 
of the booklets, as shown in fig. 5 (a), has been here made to project : (a) the 
fibre connecting it with a booklet. 
Fig. 8. The growing extremity of an entozoon, showing the extreme end filled with minute 
molecules and globular corpuscles in various states of development. 
Fig. 9. The end of an entozoon covered with cilia-like fibres, and containing molecular 
matter ; also a transverse section of the body or middle part covered with 
cilia-like fibres placed upon an investing membrane, and filled with reniform 
corpuscles. 
Fig. 10. Reniform corpuscles removed from the interior of an entozoon by pressure. 
Fig. 11. The earliest recognizable form of the vermicular state of the Cysticercus cellv- 
losce contained in the interior of a primary muscular fibre. 
Fig. 12. A Cysticercus of the vermicular form removed from the interior of a muscular’ 
fibre, showing the dkection and the arrangement of its cilia-like fibres. 
Fig. 13. A Cysticercus similar to the above, showing the exceedingly thin investing 
membrane at one of the extremities, devoid of cdia, this part being only of 
very recent formation. 
Fig. 14. A Cysticercus in the substance of a primary muscular fibre ; the cilia-like fibres 
are only faintly visible, being pressed by the surrounding muscular substance 
closely to the animalcule. 
Fig. 15. A Cysticercus in its vermicular state taken from the muscular parietes of the 
heart, showing its general form and its cilia-like fibres. The latter are much 
less distinct than in vermicular Cysticerci taken from other striped muscles. 
Fig. 16. The ciliated investment of a portion of a Cysticercus of the vermicular form, 
from which the reniform corpuscles have been removed. 
PLATE XI. 
Fig. 1. Shows a Cysticercus of the vermicular form folded upon itself in an adventitious 
cyst, a portion of which is seen upon one of the ends of the animalcule. 
This Cysticercus, as thus folded up, measm-es ^^th of an inch in length. 
