There is another group of amebas in which the endoplasm is much more fluid than in _dubia_. To this group belong _Amoeba limicola_ (Figure 5) and _Pelomyxa schiedti_ (Figure 6). The latter never forms pseudopods, and the former does so very seldom. _A. limicola_ is extremely fluid, and in locomotion the flow of the endoplasm can hardly be called streaming, for it rushes about in the body as if it were only partially under control. The ectoplasm does not give way steadily at the anterior end during locomotion, allowing a steady forward flow of the endoplasm, but it breaks away suddenly here or there, allowing the endoplasm to rush through as if it were under considerable pressure. When the endoplasm rushes through these breaches in the ectoplasm, it is usually deflected back along the side of the ameba for a considerable distance, thus leaving a part of the old ectoplasmic wall stand for a few seconds between the reflected wave of ectoplasm and the main body of the ameba. It is then that one can observe especially well the very thin ectoplasm covering the ameba, the thickness of which is about one-fortieth the diameter of the ameba. This ameba is somewhat dorso-ventrally flattened and generally oblong in shape during locomotion. [Illustration: Figure 6. _Pelomyxa schiedti_, after Schaeffer. _b_, bacterial rods characteristic of the genus _Pelomyxa_. _c, v,_ contractile vacuole. _g_, glycogen bodies. _n_, nucleus. _u_, uroidal projections. At the left is shown a series of outlines of the animal during locomotion. Length, about 75 microns.] _Pelomyxa schiedti_ moves in much the same way that _Amoeba limicola_ does; that is, by eruptive waves of endoplasm which are usually deflected back along the side (Figure 6, at the left). The endoplasm is likewise of very thin consistency. The thinness of the ectoplasm and the ease with which it may be ruptured, is very well shown by the fact that the large irregular glycogen bodies (Štolc, ’00) which fill it to capacity, lie so close to the surface that it is frequently impossible to see any protoplasm between them and the exterior. The contractile vacuoles which are numerous, also testify in their characteristics, to the ease with which the ectoplasm may be broken. The vacuoles never reach but a very small size (four microns in diameter) presumably because of the thin consistency of the endoplasm and because they can readily break through the ectoplasm. They burst on the surface of the ameba instantaneously, as a small air bubble might burst on pure water. But this ameba differs from _limicola_ in that a cross section of the body is very nearly a circle. [Illustration: Figure 7. _Amoeba radiosa_, after Penard. _a_, the rayed stage. _b_, the rayed stage in which some of the pseudopods are being withdrawn. One of them is thrown into a spiral as it is being withdrawn. _c_, the stage preceding the trophic stage shown at _d_.]