Another species of ameba in which a trophic as well as a rayed stage is found, is the recently described species _bigemma_. In this species the rayed stage is only of occasional occurrence (Figure 8, _b_). The larger the ameba is, the rarer is the rayed stage assumed. On very rare occasions one finds a rayed stage in which the pseudopods are long, straight, slender and tapering, and more or less regularly disposed around the central mass of protoplasm. The trophic stage (Figure 8, _a_) is much the more common. In this condition pseudopods are formed in large number. They are small, conical or linear, and blunt, and they do not determine the direction of locomotion, as they do in _proteus_, _dubia_, or _laureata_. These pseudopods are often composed only of hyaloplasm, though frequently the basal parts of them consist of endoplasm. When these amebas become suspended in the water, they frequently assume a shape that approaches the rayed condition: six or more long conical pseudopods are run out from the central mass of protoplasm, but the pseudopods are not straight in this case, but irregularly curved and capable of being waved about to a slight extent. The ameba readily passes from this stage to the trophic. The species _Amoeba bilzi_ (Figure 9) has come under my observation on several occasions, and its pseudopodial characters are of considerable interest in this connection. In its usual form this ameba has the general appearance of a _sphaeronucleosus_. [Illustration: Figure 9. _Amoeba bilzi_. _a_, the ameba in locomotion, showing the ectoplasmic ridges, nucleus, contractile vacuole. _b_, the transition stage between the rayed stage (which resembles that of _radiosa_, Figure 5, p. 30, somewhat) and the stage shown at _a_. The whole of the ameba flows into the broad pseudopod with the arrow. Length of _a_, 90 microns.]