— 203 — 
Fig. 46 & 47. Lumhricus agricola. (Magnified 2070 diameters; 
Zeiss. Hom. im. ViS' 4-) Sections of ganglion cells of the 
ventral nerve-cord. a Lightly staining parts of the proto- 
plasm. npr Nervous processes. 'br, hr^ Side-branches, 
given off from the nervous process. p pr Protoplasmic 
processes. cm Neuroglia-sheath of the ganglion cells. 
mi Neuroglia. nur Neuroglia retuculatation. n Nouroglia- 
nucleus. 
» 48. Fatella vulgata. (Magnified 2070 diameters; Zeiss. Hom. 
im. '/18' 4-) Section of a ganglion cell of the pedal nerve- 
cord. npr Nervous process. nur Neuroglia-reticulation. 
» 49 & 50- Patella vulgata. (Magnified 11 50 diameters; Zeiss 
Hom. im. '/jg, 2.) Sections of ganglion cells ; tåken from 
transverse sections of the pedal nerve-cord. npr Nervous 
processes. npr^ Roots of nervous processes. hr Branches 
given off from the nervous process. ppr Protoplasmic 
process terminating under the perineurium. pe Perineu- 
rium. n, n^ Neuroglia-nuclei. w'' Nucleus situated outside 
the perineurium and belonging to it. nur Neuroglia- 
reticulation. 
Plate VI. 
All the illustrations of this plate are drawn from the microscope 
directly upon the stone under the camera lucida. 
Fig» 51 — 54- Patella vulgata. (Magnified 1350 diameters; Zeiss 
F, 4.) Isolated ganglion cells of the pedal nerve-cord. 
npr Nervous process. gr Yellow granules (containing 
hæmoglobin.?) occurring in the protoplasm of the cells. 
gr^ Simular granules exuded from the cells. a (fig. 52). 
Large granule of yellow substance, being formed on a 
place where such substance is exuded from the cell. 
h Side-branches, given off from the nervous processes. 
ppr Protoplasmic process. a (fig. 54) Short process or 
prolongation of the nucleus of the ganglion cell. (The 
cells were isolated in acet. ac. (ij, glycerin (i), aqua 
dest. (5) or in weak solution of alcohol and stained with 
ammonia-carmine). 
» 55 — 57- Pliallusia venosa. (Magnified 1350 diameters; Zeiss 
F, 4) Isolated ganglion cells from the brain. Fig. 55 & 
56 Peripheral cells. Fig. 57 Tripolar cell situated in the 
