. Journal of experimental zoology. end instead offlowing forward as he finds them. If Fig. 4 is inverted we havethe Amoeba as he saw it. All other forms of Amoebae advance much more Hke extend the anterior end free in the water and attach it at ornear the tip and then contract. At the same time the posteriorend is contracting and the substance thus pushed and pulledforward goes to form the new anterior end. This continues aslong as the Amoeba advances (Figs. 20, 21, 22 and 23, also PI. I,Figs. 6, 7 and 8). Often the anterior end is pushed along thesubstratum but no attachments
. Journal of experimental zoology. end instead offlowing forward as he finds them. If Fig. 4 is inverted we havethe Amoeba as he saw it. All other forms of Amoebae advance much more Hke extend the anterior end free in the water and attach it at ornear the tip and then contract. At the same time the posteriorend is contracting and the substance thus pushed and pulledforward goes to form the new anterior end. This continues aslong as the Amoeba advances (Figs. 20, 21, 22 and 23, also PI. I,Figs. 6, 7 and 8). Often the anterior end is pushed along thesubstratum but no attachments form except at definite points. In other cases the anterior end is lifted free and then curves 352 Oris P. Dellujger down to the substratum and attaches, forming a long loop (PI. II,Figs. I to lo). The posterior end is then released and the sub-stance flows over to the anterior end. At the same time anotheranterior end is extended. Amoeba proteus frequently uses thismethod (Fig. 24) and a small undetermined form appears to move I. A A B B B B Fig. 20. A. proteus, side view showing shape and points of attachment and the method generallyused by this form in advancing. At position /, the .Amoeba is attached at a and h and forms a longloop; at position 2, a new anterior end has been extended; the points of attachment at a and h are welldefined and the substance is drawn up into posts; at position 5, attachment a has been released and anew attachment formed at c; a new anterior end has been pushed out at 4 and brought to thesubstratum and attached. The Amoeba continues this as long as it advances. Figs. 21 and 22. Side views of small undetermined Amoeba showing points of attachment. Fig. 23. Side view of A. limax showing points of attachment. Fig. 24. Side view of A. proteus showing how it moves by long loops. Fig. 25. Side view of the small Amoeba referred to above, showing how it loops along in changingfrom one point of attachment a, to another h. At 2, attachment h is just
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
