EXPLANATION 



OF THE 



FIGURES. 



1. The upper side of the Planaria Flexilis, 

 wherein the specks or eyes may be discerned. 



2. The under side, exhibiting a faint indica- 

 tion of the site of some of the viscera. 



3. Planaria Nigra, viewed from below. 



4. Its egg magnified. 



5. One of the young magnified, to shew the 

 position of the marginal specks or eyes. The 

 cylindrical appearance denotes the situation of 

 the proboscis. 



6. 7. The upper and under surface of the Pla- 

 naria Panniculata. 



8. Planaria Felina, as seen from above. 



9. A fragment of the same animal, which has 

 detached itself by spontaneous separation, to be- 

 come a new Planaria, magnified. 



