618 
rjlOTOZOA. 
3rd. The volvocine stage, in which the daughter-cells escape from the parent 
cyst, but still cohere together in a ciliated globe, the cilia being developed on 
the external surfaces of the component cells. 4th. The peritrichal stage, in 
which the ciliated globe breaks up into its constituent cells, which, swim- 
ming away, closely resemble peritrichal infusoria in general appearance. 
6th. The Amoeba stage, in which the individual cells sink to the bottom, 
retract their cilia, and in their place protrude bundles of pointed pseudopodia. 
Development supposed to begin again by the encystment of the Amcebee ; 
but this was not directly observed. In all stages, each cell-element of the 
MagosplicEfi'a possesses a nucleus; and in the volvocine, peritrichal and 
amoeboid stages, likewise a contractile vacuole. For this organism Hiickel 
provisionally frames a new division, Catallacta, of his kingdom of Protista 
(Jen. Z. Nat. vi. 1870, pp. 1-22). 
Vampyrella gomphonematisy sp. nov., Iliickel (Jen. Z. Nat. Bd. vi. p. 23), 
Bergen ; Protomonas huxieyi, sp. nov., Iliickel (ih. p. 20), Bergen ; Pro- 
tamoeba simplex^ sp. nov., Iliickel {ih. p. 32), Jena ; P. agilis, sp. nov., Iliickel 
(ib. p. 33), P. polypodia, sp. nov., Hiickel (^&. p. 34), Bergen, = Amoeba poly- 
podia^ Schulze (?). 
Hackel writes likewise on the identity of ciliary and amoeboid proto- 
plasmic movement, considering the former to be only a definite modification 
of the latter. When the swarm-spores of Protomyxa aurantiaca and Proto- 
monas huxleyi settle down into amoeboid bodies their flagella become 
pseudopods ; and Iliickel observed the same process to take place in a fla- 
gellate sponge-particle from Leucosolenia. The passage of amoeboid processes 
into cilia, on the other hand, was first observed by Hackel in the ova of 
Siphonophora, and again in the course of development of the singular organism 
Magosph(xra. (Jen. Z. Nat. 1870, v. pp. 492-650.) 
