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THE AMERICAN MUSEUM JOURNAL 



In the middle of the animal is the oval nucleus, which is the essential 

 center of its life activities, and which is itself extremely complex both in 

 structure and in function. It is inclosed in a transparent double-walled 

 "central capsule," in this species red in color, containing a portion of the 

 living protoplasmic cell-substance (endoplasm) which is continuous 

 with the surrounding outer protoplasm {ectoplasm) through openings 

 at the summits of the three conical projections. The central capsule 

 is partly imbedded in a mass of granular pigmented substance (the 



THE PROTOZOAN, AULOCER-OS ELEGANS HACKEL. 



Glass model, greatly enlarged. Made by H. Midler under the direction of R. W. Miner. 



