392 ELERY R. BECKER. 



DESCRIPTION OF PLATE. 



(Free-hand drawings of actual specimens, except where stated otherwise.) 



1. Amoeba dubia in normal locomotion. 



2. The fragment containing the nucleus, immediately after merotomy. 



3. The fragment without a nucleus, containing the contractile vacuole. 



4. Enucleated fragment in which streaming is arrested. The hold on the 

 substratum is lost, and withdrawal of pseudopods and wrinkling of the surface has 

 commenced. 



5 and 6. The same fragment in the wrinkled condition. The contractile vacuole 

 is not visible in this condition. 



7. Streaming and pseudopod formation resumed, but not yet attached to 

 substratum. Contractile vacuole again appears. 



8. Streaming of enucleated fragment with pseudopod formation. 



9. Limax streaming with small lateral branching, typical of enucleated fragments. 



10. Enucleated fragment, practically dead. 



ii and 12. Both fragments in stimulated condition. 



13. Transitional stage to 14. 



14. Wrinkled sphere appearing soon after typical stimulated condition in 

 enucleated fragments. 



15. Projection of pseudopod. 



16. An enucleated amoeba, moving in an almost normal manner, which has 

 ingested and partially digested a number of Euglenae. 



17. Food cup superimposed on a food cup of normal amoeba in act of feeding. 

 18 to 22. An Euglena entering an enucleated amoeba with final food vacuole 



formation. 



23 to 26. An enucleated amoeba dividing autonomously (camera lucida drawings) . 



27. Food cup induced in an entire amoeba by agitating tip of glass rod in water. 



28. Abortive reaction of enucleated amoeba to the same stimulus. 



