JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE II, 
Illustrating Prof. Max. Schultze’s paper on the Phenomena of 
Internal Movements in Diatomacex of the North Sea. 
Fig. 
14, ehielsiohis styliformis, Brightwell. 
1. A perfect living specimen. x 72 diam. 
2, 3. The ends of two specimens still adhering to one another 
after the division in different positions. x 180 diam. 
4. The end of a specimen which had been made red-hot, showing 
the characteristic surface marking. At a, a, are places which 
possibly are apertures in the shell. x 180 diam. 
5—10.—Rhizosolenia calcar avis, mihi. 
5. A living example. x 72. 
6. A similar one in the act of division. x 72. 
7. The two ends of aspecimen. x 330. 
8. The inferior ends of two examples adhering to each other, in 
the interior of which newly developed points lie. x 180. 
9a. One of the newly developed points shown in fig. 8, at a, a. 
x 330. 
10 a. One of the points shown at 4, 4, in fig. 8. x 330. 
11, 12.—Denticella regia, mihi. 
The former is shown alivey the latter without its organized con- 
tents, and caught whilst dividing. The position of the 
nucleus is only indicated by the dark granular masses extend- 
ing themselves in a radiate manner. Both x 180 diam. 
13.—€oscinodiscus centralis, Ehrenberg. Alive. X 180 diam. The sculp- 
ture of the shell is so fine that it is not visible with so low a 
power. It is adapted also in its organized contents to the other 
Coscinodisci occurring at Heligoland. 
These figures are all drawn with Nobert’s camera lucida. 
