Archer — On Freshwater Rhizopoda. 
97 
''conjugated," rather then truly only one individual becoming two by 
a self-division. 
The specimen before us (Fig. 7), happens to present a further 
characteristic, which, perhaps, may be worthy of just a passing note, 
for no light can be thrown on its possible significance. I allude to 
the presence of the rather large, opaque, colourless, shiny, somewhat 
pearly-looking, broadly- elliptic body immersed in the sarcode body-mass, 
and between the two conjoined bodies of the ''conjugated" pair of 
individuals ; this seems homogeneous, and does not seem to show any 
nucleus or wall." It appears, I think, to be a precisely similar body 
to that recorded and figured by Stein, as present in examples of his ^o- 
called Actinophri/s oculata, themselves conjoined or conjugated.'^ Upon 
this problematic body, Stein himself seems to be able to throw "not 
any light, thinking it however an introduced foreign body, and referring 
to Cohn's remarks on a similar body in A. Mchhornu (which see). I 
should myself hardly be disposed to attribute its existence here to a 
result of the "zygosis" or "conjugation," for quite identical bodies 
occurred in the extra-capsular region of unconjugated specimens in the 
same material ; still, it might possibly be supposed in their case, too, 
that such may be produced in someway as a result of conjugation, and 
that, after separation, one of the individu/als may have borne away 
with it this peculiar-looking body. I have also sometimes seen similar- 
looking bodies in the substance of certain other Ehizopoda. Al- 
though, then, the significance of this structure is so obscure, it seems to 
be too conspicuous and prominent a constituent of the tout ensemble of 
the present examples to be altogether unimportant, but a decision as 
to its nature must be left for further observation. 
Another point presented by the examples shown in my Figures 
(Fig. 7, 8) relates to the yelloiv globules appertaining to Acanthocystis 
spinifera. Greeif seems to suggest the probable identity or homology 
of these with the green chlorophyll-granules of ^. turfacea, and of those 
again with ' ' yellow cells. ' ' I believe, however, they are here nothing but 
oil-globules. Greeif depicts them as all of one light yellow colour ; they 
appearrather of various hues, ranging from a pale yellow to a deep orange, 
and even a bright coppery colour, in one and the same individual; they 
are of very shiny appearance and of varied sizes — in fact, altogether 
like admitted oil-globules in other organisms; they have no "special 
wall," no "nucleus" — their varied and bright appearance, when pre- 
sent, renders this form one of singular beauty. Greeff very cor- 
rectly describes the fact that they sometimes come forth from the 
rhizopod, not indeed simply, as I regard them, as isolated oil-drops, but 
these are surrounded, as he mentions, by a hah of pale sarcodic-looking 
substance. They then, no doubt, very closely resemble what would 
be a very minute form of Diplophrys (Barker), wanting, however, the 
tufts of pseudopodia. But I must still observe that to my eyes they 
* Stein : "Die Infusionsthiere auf ihre Entwickelungsgeschichte untersucht." 
p. 163, t. V. fig. 27, X. and X. ; also Pritcliard's "Infusoria," PI. xxiii., fig. 25. 
R. I. A. PROC. — VOL. I., SER. II., SCIKNCE. 0 
