HAVING endeavoured in the foregoing to give some account of the remarkable form, Diaphoropodon mobile, I pass on to the three others, which in the present series seem next related thereto, figured on Pl. XX, figs. 1, 2, 3 (vol. ix), and which I would (provisionally at least) identify as above. I regret, however, that I have it in my power, at present at least, to do but very little more than refer to the figures and the accompanying explanation of the plate. It will be seen by the appended notes of interrogation that it is not without some amount of uncertainty as yet that I refer these forms to Claparède and Lachmann's genus, which is thus characterised:—"Body covered by a test furnished with a single opening, and formed of foreign substances agglutinated by means of an organic cement," to which diagnosis is prefixed the remark that this genus is to the Actinophryans as the Difflugiæ are to the Amœbæ.¹