JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE XI, 
Illustrating Dr. Macdonald’s Paper on the Thalassicollida?. 
Fig. 
1. — Globular specimen of Spharozoum, natural size. 
2. — Portion of the same, highly magnified, to show the structure of the 
puncta as described in the text. 
3. — Globular specimen of Collosphcera, natural size. 
4. — Analysis of a single punctum of the same. a. Punctum in its entirety. 
b. The fenestrated shell, c. The sarco-blasts and cell membrane. 
d. Granular and crystalline contents, e. Fatty globule or nucleus. 
5. — Example of Sphcerozoum, like fig. 1, natural size, for comparison with — 
6. — An enlarged representation of the same, in which the test, vacuolated 
matrix and the disposition of the puncta are distinctly seen. 
7. — Thalassicolla nucleala, natural size. 
8. — The same, considerably magnified, showing the test, vacuolated matrix, 
radiating fibres, sarco-blasts, pigment, proper cell membrane, with 
rounded granular contents and vesicular nucleus containing minute 
fatty globules. 
