JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE VIII, 
A. Illustrating Dr. Rorie’s paper on the Nervous System of 
Lumbricus terrestris. 
Fig. 
1.—Ganglion from ventral chain of worm. 
2.—Nerve-cells of sub-cesophageal ganglion. 
3.—Ditto of supra-cesophageal ganglion. 
4.—Ditto of one of the ganglia‘of Mytilus, 
B. Illustrating Prof. Max. Schultze’s paper on the Structure 
of the Valve in the Diatomacez. 
Fig. 
1 (1).—A siliceous vesicle produced by the slow decomposition of fluo- 
silicic acid gas in a moist atmosphere. X 300 diam. 
2.—Section of a vesicle, showing the elevations on the surface. 
3 (4).—A diagrammatic figure to represent the laminated structure of the 
elevations of the wall of the vesicle. 
4, (5).—The moniliform arrangement of the siliceous particles of which the 
wall of the vesicle is constituted. 
5 (12).—A portion of the surface of a siliceous pellicle, with acuminate 
elevations, hexagonal at the base. 
6 (14).—To show the mode in which, by an alteration of the focus, the 
appearance of the elevations alters, owing to their laminated 
structure. 
6a (14a).—A side view of the same. 
7 (15).—The surface of a thin pellicle, not quite in focus. 
8 (16).—The surface of a pellicle, strongly resembling that of a diatom. 
9 (17).—The same, viewed on the side, and showing the dots to correspond 
to elevations. 
10 (19).—The surface of a pellicle covered with irregular-sized elevations. 
11 (21).—The appearance of Plewrosigma angulatum photographed through 
one of Hartnack’s immersion-lenses, No. 10. 
