70 
Dr. Wallich, ow the Polycystina. 
minifera on the one side^ and promote Gromia to the highest 
Order on the other. 
Order I. — Herpnemata. 
The primary and secondary characters of this Order are 
as follow : — No definite nucleus. No contractile vesicle. 
Sarcodcj without any appreciable differentiation into endo- 
sarc and ectosarc, consisting of homogeneous viscid proto- 
plasm^ in the substance of which vacuolar cavities occasionally 
occur. Pseudopodia forming frequent anastomoses and ex- 
hibiting, both along the surface and within their substance, 
the phenomenon of pseudo-cyclosis. 
In Lieberkuhnia and Pamphagus (organisms which I have 
not myself met with) no bodies corresponding to the sarco- 
blasts of the Rhizopods are spoken of by their discoverers. 
But, inasmuch as they have been detected by me in every other 
family, it is possible that they really exist and have yet been 
overlooked^ owing to their being colourless amongst the crowd 
of granular and foreign bodies said to have been present. 
The difficulty of detecting the sarcoblasts in the fresh-water 
Amoebans, in which the absence of colouration renders them 
much less easily discernible than in the Protodermata (all of 
which, as yet known, are oceanic), lends force to such a sup- 
position. The circumstance, however, to which I beg to 
direct attention specially is this — that Lieberkuhnia and 
Pamphagus are the only Rhizopods belonging either to the 
Herpnemata or Protodermata of my system in which distinct 
evidence has been adduced of the power to incept solid par- 
ticles as food, Avhilst amongst the large series of forms 
grouped by me in the Proteina there does not occur a single 
example in which it is not easy to trace the faculty. So that, 
even allowing, for the sake of argument, that the generaliza- 
tion may turn out to be only partially correct, owing to un- 
recognised difficulties in the methods of observation, we have 
nevertheless presented to us, in the occurrence of these very 
difficulties, a useful subsidiary character. 
Of the animal of the Foraminifera it is unnecessary for 
me, in the present communication, to say more than I have 
already done, beyond pointing out that the " yellow bodies'^ 
(well known as occasionally occurring, and to which I have 
given the name of sarcoblasts/' with a view to distinguish them 
from other corpusculcs of nearly similar size and appearance, 
but of different origin) are the true rudiments of the young 
* Prom aapK, flesli, and (iXaarn^ offsliooi. The nature pf these bodies 
will be more particularly detailed in connection with the Polycystina. 
