EXPLANATION OF THE PLATES. 



a a a. Small cells arising from the attached surface of the tubular 

 membrane. This is the manner in which the original group 

 increases in size. 



b. More advanced. 



c. First stage of second mode of development, or that for the 

 extending of the parasite to as yet uninfested parts of the 

 body, for the purpose of forming new groups. 



d. Second stage. 



e. Third stage. 



/. Root where the original germ became fixed. 

 g. External or tubular membrane. 

 Fig. 10. Section of Astoma acephalocystis, showing its internal structure 



PLATE XII. page 487. 



Fig. 1. Portion of sac of Cysticercus, much magnified. 



a. Absorbing cells of absorbing membrane. 

 6 6. Separate ova, after their escape from the pedicle. 

 Fig. 2. Cysticercus neglectus very much magnified. 

 Fig. 3. Small portion of omentum containing Cysticercus neglectus, 



showing the bodies considered to be young Cysticerci attached ; 



the omentum has been folded over, and the young (a) are seen 



attached to the fold. 

 Fig. 4. The natural size of the animal supposed to be a new Csenurus 



Ccenurus hepaticus. 

 Fig. 5. Magnified view of the head of Acephalocystis armatus in a more 



advanced stage than the former figure. 

 Fig. 6. The germinal membrane from which it was taken. 

 Fig. 7. The absorbing membrane of cyst of Cysticercus rattus highly 



magnified. 



Fig. 8. Teeth of Cysticercus rattus highly magnified. 

 Fig. 10. Ovum of Cysticercus rattus highly magnified. 

 Fig. 11. Ova from pedicle of Cysticercus rattus highly magnified. 



PLATE VI. page 445. 



Fig. 8. Gymnorhynchus horridus within its cyst. 

 Fig. 9. exposed. 



Fig. 10. First stage of Ccenurus cerelralis. 

 Figs. 11, 12, 13, 14. Second, third, fourth, and fifth stages of the dis- 



coidal period of development of Ccenurus cerebralis. 

 Fig. 1 5. One of the first stages in the vertical period of development. 

 Fig. 16. Sphairidion acephalocystis highly magnified. 

 Fig. 7. Neuronaia monroii. (J. Goodsir.) 



a. Suctorial mouth. 



6. Acetabulum. 



c. Orifice of organs, supposed to be reproductive. 



d. Posterior orifice, by which the sigmoidal "cistern a chyli" 



e. Opens, and apparently also, 



