BY THOS. STEEL. 119 



fugitive tints of such forms as Geoplana sancjuinea and G. 

 IlilUi, being retained almost perfectly. At present I have in 

 hand a series of experiments for the purpose of finding the' best 

 method of applying this preservative to general natural history 

 specimens, and should T arrive at any results of value I propose 

 at a future time to communicate them to the Society. 



It should be borne in mind that no preserving medium will 

 prevent the bleaching of any of these objects by light, and it is 

 necessary with land planarians as with the others to keep them 

 as much as possible in darkness, or at least away from strong 

 light. 



EXPLANATION OF PLATES. 



Plate VI. 



Fig. \. — Geoplana par ra. 

 Fig. 2. — Geojjlaiia degans. 

 Fig. 3. — Gzoplana pondei'osa. 

 Fig. 4. — Geoplana robusta. 



Plate VII. 



Fig. 0. — Geoplana HUlii. 



Fig. 6. — Geoplana quinqitelinenta. 



Fig. 7. — ,, ,, vai-. accentuata. 



Fig. 8. — Geoplana alholin.tafa. 



Fig. 10. — Geoplana atrala. 



