22 Mr. H. J. Carter on Freshwater. Rhizopoda 
add to it here, except that certain bodies in the sarcode, which I 
supposed to be larger starch-granules, now appear to me to have 
been cells analogous to, if not homologous with, the “ repro- 
ductive” ones described in Ameba princeps, which will presently 
be seen to exist also in D. compressa, n. sp. 
The type form (perhaps) of the test of D. pyriformis, with its 
varieties—together with delineations of the animal, its nucleus 
in a spheruliferous condition, also im the effete state after the 
spherules have passed into the body, and, finally, their develop- 
ment in the watch-glass—will be found in Pl. I. figs. 1, 2,3, & 4, 
illustrative of all that has been described in the paper to which 
I have alluded. It should be remembered, however, that, if 
(in fig. 1) the animal part had been shaded sufficiently deep to 
represent its normal green colour, it would be nearly black. 
Both the faint yellowish tint and the form of D. oblonga, Ehr. 
(tab. 9. fig. 2), seem identical with the generative stage of D. 
pyrtformis that I have termed “ colourless.” 
Difflugia compressa, n. sp. PI. I. figs. 5 & 6. 
Test lagenoid, compressed, circular posteriorly, elongated mto 
a short neck, with even aperture anteriorly *; composed of hya- 
line grains of quartz-sand held together by a gelatinous (albu- 
minous ?) substance ; presenting a dark, undulating, collar-like 
mark at the junction of the neck with the body of the test. 
Animal composed of diaphane and sarcode, the latter charged 
with molecule,’ “granules,” portions of undigested food, 
starch-granules, yellow oil-globules, and small brown cells, which 
latter appear to impart to it its characteristic light-brown colour. 
Granules minute, colourless. Nucleus probably posterior, but 
not seen in situ; vesiculz or contracting vesicles also ae 
posterior and marginal, as in D. pyriformis. 
Hab. Heath- bos water. Abundant among conjugating con- 
fervoid Algze and “Desmidier. Progressing with the oral aper- 
ture downwards and the test erect. Locomotion and capture of 
food performed by obtuse digital prolongations of the body slowly 
projected from the aperture. The “ brown cells” do not enter 
the pseudopodia. 
Size. naa zi,th, greatest breadth of broad side =+,th, 
geste sind, greatest breadth of narrow side =4,th, aperture 
;1,th of an inch. 
Loc. England; south coast of Devon, Budleigh-Salterton. 
Observations. They werefound in abundance about the middle of 
September, in company with conjugating confervoid Algz, &c., as 
* Of course, where the test is covered with grains of sand, the outer 
margin of the aperture.must he rough ; but where these grains are absent or 
scanty, the inner one is found to be smooth and even. 
