— 195 — 
4- Homarus vulgaris (Magnified 950 diameters; Zeiss. Hom. 
im. V'i8» i)- Longitudinal section of the same nerve-tube 
as is illustrated in fig. 3 (of the same piece of an oeso- 
phageal commissure was first tåken transverse sections, 
and subsequently longitudinal sections. a, dl Deeply staining 
axis. 6 Externel layers of primitive tubes which are 
samewhat obliquely transsected. c^å Neroglia-sheath of 
the nerve-tube, which on one side (c) is considerably 
thicker than on the other. Iz Neuroglia-nucleus situated 
inside the sheath. 
5. Nephrops norvegicus. (Magnified 950 diameters; Zeiss. 
Hom. im. ViS' i-) Transverse section of nerve-tubes, 
from an oesophageal commissure. a Inner layer of the 
connective-tissue surrounding the bundle of nerve-tubes 
of the commissure (compare fig. i, c). h Outer layer of 
the same connective-tissue (compare fig. i, h). t, f Trans- 
sected nerve-tubes; in the right one is a very slight 
concentration towards a deeply staining axis visible. 
t\ f\ Nerve-tubes with vacuoles, which possibly, to 
some extent, are transsected tubes, Nerve-tubes con- 
taining solely large meshes, which possibly are transsected 
tubes, c Vacuoles. Jc, \, h\ lc \ Æ"' Neurogla-nuclei and 
nuclei of the connective-tissue. Neuroglia-nucleus situated 
inside the sheath of a nerve-tube. The preparation was 
fixed in Lang's fluid {corrossive sublimat 12 7o) 3ind stained 
with liæmotoxylin. 
6. Nephrops norvegicus. (Magnified 1700 diameters; Zeiss. 
Hom. im. Vis» 3-) P^irt of the contents of a nerve-tube 
highly magnified to show the walls of the primitive tubes. 
a Thickenings in these walls along the concreting edges 
of the tubes. From the same preparations as fig. 5. 
7. Homarus vulgaris. (Magnified 1 90 diameters ; Zeiss CC, 2). 
Transverse section of a small peripheral nerve containing 
large and small nerve-tubes. f Large nerve-tubes; their 
sheaths are very thick and consist of several layers. 
n t Small nerve-tubes. s Septa, dividing the small nerve- 
tubes into bundles, k Neuroglia- and connective-tissue- 
nuclei. 
8. Homarus vulgaris. (Magnified 11 50 diameters; Zeiss. 
Hom. im. Vig' 2.) Transsected nerve-tubes from a peri- 
pheral nerve, nt Small nerve-tubes containing some few 
