BIHANG TILL K. SV. VET. AKAD. HANDL. BAND 21. AFD. IV. N:0 3. 7 
Signification of the letters. 
a. Basal stratum. 
b. Vacuole stratum. 
c. Haversian canals. 
d. Pulpa canals. 
e. Dentine tubes. 
h. The open grooves be- 
tween the ridges. 
+ Fragments of partition 
walls. 
The dotted lines are the 
contours of ducts and ca- 
nals lying under the sur- 
face of the transparent sec- 
tion. 
Fig. 2. 
Obligue section of portion 
of the scutum, crossing 
all its strata. 
