EXPLANATION OF THK PLATES. XXVU 



a a a. Small cellis arisui*^ from the attuched surface of the tubular 

 meialaiiue. This is the mauuer m which the original group 

 iii<rea.<es in size. 



b. ilore advanced. 



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

 extending of the parai^ite to as yet uuinfested parts of the 

 body, f(jr 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 Asti/ma acephalocystis, showing its internal structure 



Plate XII. page 487. 



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

 a. Absorbing cells of absorbing membrane. 

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

 Fig. 2. Cysticercus neglecUis very much niiignified. 

 Fig. 3. Small portion of omentum containing Ciistlcercus negUctxi*, 



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 Caenums — 



Cii'iiunis hepaticus. 

 Fig. 5. Magnified view of the head of Jc<y)Art7oo»/«^> ar7na;i« in a more 



advanced stage than the former figure. 

 Fig. 0. The germinal membrane from which it Wiis taken. 

 Fig. 7. The absorbing membnme of cyst of Cysticercus rati us highly 



magnified. 

 Fig. 8. Teeth of Ci/sticcrcus rattas highly magnified. 

 Fig. 10. Ovum of Cysticercus rattas highly magnified. 

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



Plate VI. page 445. 



Fig. 8. Gymnorhynchus horriJus within its cyst 

 Fig. 9. exposed- 

 Fig. 10. Fii-st stage of Canuras cerchralis. 

 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. IG. Splutiridion acephaloci/stis highly nuignified. 

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



a. Suctoriid mouth. 



b. Acetiiliulum. 



c. Orifice of organs, supposed to be reproductive^ 



d. Posterior orifice, by which the sigmoidal ** cislcma chyli" 

 r. Opens, and apparently also, 



