Scent Apparatus in the male of Amauris mavius. 401 
scales is indicated by dotted lines, from which it will be 
seen that each scale serves as a cover for one of the rounded 
projections. Fig. 12 shows the appearance of a trans- 
verse section of this portion of the wing. On the upper 
surface the rounded bodies protrude some distance from 
the wing membrane and their outer surfaces are closed 
by a thin chitinous covering, each pierced by a minute 
pore.* Although provided with a covering, we may for 
convenience call these structures the scent cups. Between 
each pair there lies a scale socket. The space between the 
wing membranes is principally occupied by large cells, 
which are greatly distended with globules of material 
having a fatty appearance. If the specimen has been 
treated for a short time with eau-de- -javelle, this substance 
is dissolved and the space they occupied is represented 
by large irregular vacuoles. If a section be taken to include 
the nervure, it is seen that close to the nervure the secretion 
is so plentiful as to cause a forcing apart of the wing mem- 
branes. I have shown such a section in fig. 13, though I 
am inclined to think that the membranes would not be 
so widely separated in nature, and that the tissues have 
been partially torn or expanded by the processes of preserva- 
tion and embedding. ‘Beneath the secreting cells is a 
basement layer from which arises a network of connective 
tissue forming septa. As the scale sockets lie between 
the scent cups, strands of this connective tissue appear 
in section to proceed direct to each scale socket. It is 
not clear whether these have a direct connection with the 
sockets, though there does appear to be a small nuclear 
body beneath each socket. 
Reverting to fig. 13, the section of the nervure shows a 
lining of large cells surrounding a granular area which 
encloses a large lumen. The latter may well be an air 
vessel, the oranular portion being vascular, and we may 
suppose that the large cells are in some way intermediaries 
between the circulating fluid and the secreting cells of the 
wing patch. 
Fig. 10 shows a section parallel to the plane of the wing. 
The ‘secreting cells are seen to form small glands enclosed 
in a network of connective tissue. Hach gland presents : 
* [ was for some time under the impression that these structures 
were in the form of open cups. I am indebted to my friend Mr. 
E. 8. Goodrich, F.R.S., who happened to see some of my sections, 
for pointing out their true structure, 
