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POPULAR SCIENCE REVIEW. 
Fig. 2. A mass of sarcode in tlie chamber of a Foraminifer, a Globigerine 
shell, exhibiting sarcoblasts. 2 a, a detached sarcoblast seen 
without focussing down to an equatorial plane. 2 b, showing 
the same with the central nucleus of clear basal sarcode, as seen 
when the focussing is so adjusted as to show the equatorial plane. 
„ 3. The chambers of a Rotaline shell filled with sarcode, and containing 
sarcoblasts. 
„ 4. A Haliomma (a Polycystine) showing the nuclear sarcode aggre- 
gated around the internal chambers; and sarcoblasts between 
the nuclear mass and the inner wall of the outer foraminated 
spherical chamber. 
„ 5. A broken shell of the same, showing the disposition of the omphalic 
chamber, and the second and third chambers ; the spines ; and 
the sarcoblasts within the sarcode. 
„ 6. Acanthodesmia (Muller) showing the irregular character of the 
siliceous framework and the relative position of the sarcode and 
sarcoblasts ; the nucleus being ‘ in the second Order 9 enveloped in 
a distinct membranous capsule. 
,, 7. Acanthometrci — illustrating the radiate arrangement, and axial 
point of union of the spines at their conical bases ; the nucleus 
surrounding the bases of the spines for some distance, and the 
nuclear capsule (which in the early state of the organism, 
closely invested it) being now pushed outwards in every direction 
by the growth of the spines, and probably pierced by them. 
The sarcoblasts shown in the mass of the sarcode within. 
„ 8. A young Acanthometra , showing the nuclear capsule already 
apparently pierced by the longer spines, and pushed outwards in 
other directions by the series of shorter spines. This is the con- 
dition which the young Acanthometrce usually present. The 
nucleus is not represented, being at this stage of the organism’s 
growth scarcely visible, both from its minute dimensions and 
comparative absence of colour. 
„ 9. A separated siliceous chamber of one of the composite Collo- 
sphceridce — the perforations on which give it, at first sight, the 
appearance of a Polycystine shell. Within is seen the massive, 
often richly coloured, nucleus, its nucleolus, and its investing 
capsular membrane, with sarcoblasts in the sarcode between the 
capsule and the wall of the shell. 
„ 10. The siliceous structure of Dictyocha , as seen from above; the 
twin siliceous framework being very faintly indicated beneath. 
„ 11. Diagrammatic outline of the two basket-shaped, twin pieces, 
which enter into the structure of each living Dictyocha , the 
nucleus, nucleolus , membranous capsule, enveloping sarcode, and 
sarcoblasts being shown also. 
„ 12. The sarcoblast of the Polycystina, a, as seen in an axial plane, in 
order to show the point of union at the immediate centre of the 
spinelets which constitute the omphalostype of the Cyclodinal 
division ; and b, the appearance of the same from above. 
,, 13. A sectional view of a Haliomma , showing a sphcerodinal ompha- 
lostype ; the omphalic chamber around it, two succeeding cham- 
