In size it is about midway between the latter species and _striata_. It always has a number of prominent longitudinal ridges on its upper surface. Its mode of streaming is essentially like that of _striata_ or _sphaeronucleosus_. When this ameba is disturbed and left suspended in the water, it throws out four or five or more long slender pseudopods composed entirely of hyaloplasm, excepting a bulbous base which consists of granular endoplasm. The pseudopods are cylindrical with tapering ends. They are very rigid, and once formed, persist for a considerable length of time. When these pseudopods are about to be retracted, the wall weakens at some point and then crinkles while the distal part of the pseudopod bends, often at a decided angle. The crinkling of the wall continues up and down the pseudopod while it is slowly being withdrawn. These pseudopods, as well as those of the rayed state in _radiosa_ and _bigemma_, are not pseudopods of locomotion but of _position_; they are not dynamic but static structures. But there are no hard and fast distinctions to be made between these two types of pseudopods, for at least in _bigemma_ and _bilzi_, there are transitional forms of pseudopods (Figure 8, _b_). The formation of pseudopods and their character depends to some extent upon the firmness and thickness of the ectoplasmic layer; and the character of the ectoplasm in turn depends largely upon the consistency of the protoplasm as a whole. In the following representative list of amebas: _limicola_, _villosa_, _dubia_, _proteus_, _discoides_, _laureata_, _bigemma_, _bilzi_, _radiosa_, _sphaeronucleosus_, _verrucosa_, the given order indicates a progressively thicker and firmer ectoplasm as one passes from _limicola_ to _verrucosa_. But from _limicola_ to _bilzi_ the number of pseudopods directing locomotion increases from one to an average of about twelve in _dubia_, and then falls gradually to one in _bilzi_ and the others beyond in the list. (See Figure 10.) Where the directive pseudopods begin to disappear, the transitional appear, viz., in _bigemma_ and _bilzi_; but beyond these no transitional pseudopods occur. But along with the transitional there begin to appear also the static pseudopods, which are seen relatively seldom in _bigemma_ and _bilzi_ while in _radiosa_ they occur at almost all times. In _sphaeronucleosus_ and _verrucosa_ no distinctive pseudopods of any kind occur.