124 DESCRIPTION OF THE PLATES. 



thing is seen in the membrane, which is quite 



homogeneous, except the small cells figured a a. 



b Is the commencement of one of the cretaceous 



fatty masses described in the text. 

 PLATE VII. Fig. 4. Several of the stages of developement of Cys- 



ticercus. 



a First stage represents spines ; hardly if at all seen. 

 b Their first decided appearance. 

 c Third stage. 

 d Fourth stage. 

 Fig. 5. Small portion of the germinal membrane of 



Acephalocystis armatus. 

 Fig. 6. Small portion, highly magnified, of the granular 



matter from the cyst of Cysticercus. 

 Fig. 7. Small portion of the inner surface of the external 

 membrane of Acephalocystis armatus while in a 

 state of degeneration. 



Fig. 8. Ovum from the pedicle of Cysticercus. 

 Fig. 9. Small portion of the germinal membrane of Ace- 

 phalocystis Monroii, highly magnified. 

 a a Fibrous basis. 

 b b Germinal vesicles. 



c c Secondary acephalocysts within the germinal 

 vesicles ; this portion was taken from the large 

 parent cyst which is the primary animal, buried 

 in the liver ; and each of the smaller vesicles 

 marked c c c belong therefore to the secondary 

 generation, their progeny again being the tertiary 

 generation. 



Fig. 10. Is a specimen of Cysticercus neglectus ruptured at 

 the fundus of the sac, apparently for the escape 

 of the young germs into the cavity of the cyst, 

 where they become attached. 



Fig. 11. Small portion of the cyst of Cysticercus neglectus 

 magnified, shewing its vascularity, and the mode 

 of attachment of the young Cysticerci to its in- 

 ternal surface. 



Fig. 12. View from above the pedicle of Cysticercus, 

 shewing the disposition of the teeth. In all 

 works hitherto published on Helmiuthology, 



