INVERTEBRATE ZOOLOGY. 



A RHIZOPOD PROTOZOAN 



(Amoeba sp?). 



PLACE a drop of water that is known to contain Amoeba, 

 upon a slide and cover with a thin cover-glass. Having 

 found an Amceba, note the following points : 



The outline is irregular, and, if the animal is active, con- 

 stantly changing. The ray-like prolongations of the body 

 are called pseudopodia. Are the pseudopodia simple, or are 

 they branched ? How many are there ? 



The body of the animal is apparently made up of two 

 portions, an inner granular portion, the endosarc, and an 

 outer clear layer, the ectosarc. Is there endosarc in the 

 pseudopodia? Careful observation will reveal the presence 

 of a circulation of the granules of the endosarc. 



Examining the endosarc with more care, it will be found 

 to contain food vacuoles, a vesicle, and a nucleus. 



^hefoodvacuoles are small, generally spherical bodies, in 

 color depending on the food that has been ingested. Around 

 certain vacuoles a clear enveloping space may be noted. 



The nucleus, not often clearly seen in the living animal, 

 may be definitely demonstrated by adding a drop of one per 



