after a few days, a young _Actinophrys_ escapes, as may take place indeed after encystment of an ordinary form without conjugation. [Illustration: FIG. 19.—_Actinosphaerium eichornii._ A, entire animal with two contractile vacuoles (_c.vac_); B, a portion much magnified, showing alveolate cytoplasm, pseudopodia with axial rods, non-nucleate cortex (_cort_), multiple nuclei (_nu_) of endoplasm (_med_), and food-vacuole (_chr_). (From Parker and Haswell.)] The axial rods of the pseudopodia may pass either to the circumference of the nucleus or to a central granule, corresponding, it would appear, to a centrosome or blepharoplast; or again, {73}in the plurinucleate marine genus _Camptonema_, each rod abuts on a separate cap on the outer side of each nucleus. The nucleus is single in all but the genera _Actinosphaerium_, _Myxastrum_, _Camptonema_, and _Gymnosphaera_. The movements of this group are very slow, and are not well understood. A slow rolling over on the points of the rays has been noted, and in _Camptonema_ they move very decidedly to effect locomotion, the whole body also moving Amoeba-fashion; but of the distinct movements of the species when floating no explanation can be given. The richly vacuolate ectoplasm undoubtedly helps to sustain the cell, and the extended rays must subserve the same purpose by so widely extending the surface. _Dimorpha_ (Fig. 37, 5, p. 112) has the power of swimming by protruding a pair of long flagella from the neighbourhood of the eccentric nucleus; and _Myriophrys_ has an investment of long flagelliform cilia. _Actinomonas_ has a stalk and a single flagellum in addition to the pseudopodia; these genera form a transition to the Flagellata. Several species habitually contain green bodies, which multiply by bipartition, and are probably Zoochlorellae, Chlamydomonadidae of the same nature as we shall find in certain Ciliata (pp. 154, 158) in fresh-water Sponges (see p. 175), in _Hydra viridis_ (p. 256), and the marine Turbellarian _Convoluta_ (Vol. II. p. 43).