— 207 — 
Fig. 73. Patella vulgata. (Magnified 750 diameters; Zeiss F, 2.) 
Part of a transverse section through a pedal nerve-cord. 
a — m, 0 Ganglion cells. n Neuroglia-nuclei. nn Similar 
nuclei or cells from which fibres issue. cn Large ovoid 
or circular neuroglia-nuclei, more lightly staining than the 
, smaller nuclei. cn Similar nuclei situated close to the 
nervous processes of ganglion cells. ds Dotted substance. 
p Perineurium, enveloping the pedal nerve-cord. nu Neu- 
roglia-reticulation extending inside this perineurium. af Fi- 
bres, neuroglia-fibres and protoplasmic processes, running 
from the ganglion cells aSi towards the perineurium. 
cct Cells adhering externally to the perineurium. (Fixed 
in chromo-aceto-osmic acid, stained with Delafield's hæ- 
motoxylin). 
» 74 Patella vulgata. (Magnified 1 1 50 diameters ; Zeiss. Hom. 
im. Vi 8' 2.) Part of a transverse section through a pedal 
nerve-cord. a — i Ganglion cells. ds Dotted substance. 
nu Neuroglia reticulation. n Neuroglia-nuclei. n' Neu- 
roglia-nuclei, adhering to the sheath of a ganglion cell. 
(Preparation the same as fig. 73). 
75 — 78- Patella vulgata. (Magnified 750 diameters; Zeiss F, 2.) 
^ , Ganglion cells with their processes. n Neuroglia nuclei. 
• ■ (Fig- 75 and 76 are isolated in glycerin (i), acetic acid(i), 
aqua dest. (5) ; fig. 77 and 78 are tåken from in sections). 
» 79 — 81. Patella vulgata. (Magnified 750 diameters; Zeiss F, 2.) 
Isolated neuroglia-cells. 
^ Plate IX. 
The illustrations of this plate (exept fig. 83 — 85) are drawn 
under the camera lucida, from the microscope directly upon the 
stone. 
Fig. 82. Patella vulgata. (Magnified 750 diameters; Zeiss F, 2.) 
Ganglion cells and their processes from a transverse section 
of a pedal nerve-cord. gc Ganglion cells. a Ganglion 
celL the nervous process of which can be traced for some 
distance through the dotted substance. n' Neuroglia- 
nucleus adhering to the sheath of this process. n Neu- 
roglia-nuclei. nc Larger less staining neuroglia-nuclei. 
(Fixed in chromo-aceto-osmic acid, stained with Delafields 
hæmotoxyline. The section was stained with picric acid 
