126 DESCRIPTION OF THE PLATES. 



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

 Fig. 2. Cysticercus negkctas very much magnified. 

 Fig. 3. Small portion of omentum containing Cysticercus 

 neglectus, showing the bodies considered young 

 Cysticerci attached, the omentum has been folded 

 over, and the young are seen attached to the 

 fold. 

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



new Caenurus. Ccenurus hepaticus. 



Fig. 5. Magnified view of the head of Acephalocystis arma- 

 tus 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 mag- 

 nified. 

 PLATE III. Fig. 8. Gymnorhynchus horridus within its cyst. 



Fig. 9. exposed. 



Fig. 10. First stage of Ccenurus cerebralis. 

 Figs. 11, 12, 13, 14, Second, third, fourth, and fifth stages 

 of the discoidal period of developement of Cce- 

 nurus cerebralis. 



Fig. 15. One of the first stages in the vertical period of de- 

 velopement. 



Fig. 16. Sphairidion acephalocystis highly magnified. 

 Fig. 7. Neuronaia Monroii. (J. Groodsir.) 

 a Suctorial mouth. 

 b Acetabulum. 



c Orifice of organs, supposed to be reproductive. 

 d Posterior orifice, by which the sigmoidal " cistern a 



chyli," 



e Opens, and apparently also, 

 / The thick walled peculiar sac. 

 g Pyriform sac, a receptacle for the ova. 

 / Male organs. 



The figure also presents the arrangement of the 

 dermal spines, and the general form of the animal. 



