Observations on British Zoophytes a7id Protozoa. 157 
In citing these instances, I do not mean to infer that 
electricity is engaged in the vital movements of the sarcode, 
but merely to show how movements resembling them can 
be closely imitated by processes connected with inorganic 
matters, the rationale of which we have no difficulty in ex- 
plaining. 
Eeproduction. — In a former paper read before this Society, 
I communicated the discovery of true ova, with germinal 
vesicle and spot, in a rhizopod Truncatalina, and considered 
that, as it was impossible that bodies of so great a size could 
escape from the openings of the shell, it was probable that 
in these genera a *' polymorphic development took place, 
similar to that described by Carter in Amoeba verrucosa, and 
such also as seems to occur in Gregarina, either with or 
without a previous process of conjugation. In Boderia 
such a development plainly occurs. In specimens under 
observation these nuclei or ova were seen to disappear ; and 
some hours afterwards the sarcode of the animal burst 
or issued from its envelope, and spread itself in ragged 
masses (fig. 3) over the glass, connected by drawn-out threads. 
In the course of a few hours later the sarcode became entirely 
dissipated, leaving a swarm of naviculoid bodies (fig. 4) 
attached to the glass, from each of which, in a day or two, 
issued a minute nucleated and amoeboid mass (fig. 7) of sar- 
code. These little amoebas existed for many weeks as a 
closely aggregated band of many inches in length near the 
surface of the water, without assuming a test, or putting 
forth pseudopodia ; nor were the latter processes ever ob- 
served, although minute specimens gradually made their 
appearance in the vessel in considerable numbers. I am 
disposed to think that the change from the naked amoeboid 
to the incysted rhizopodic form in this animal constitutes a 
distinct stage in its development. We here have the life 
. history of the Ehizopoda and Gregarinidse brought in very 
close analogy to each other : — Thus, in Gregarina we have a 
conjugating process, followed by an encysting of the animals, 
or the encysting may take place in a single Gregarina ; 
next, " certain globular vesicles appear in the cyst, and these 
become metamorphosed into ' pseudo-naviculse.'" The cyst 
