512 
G. L. GULLAND. 
It must be borne in mind that the tubes though necessarily 
drawn on one plane in order to show the relation of the whole, 
are really clustered together, so that the true appearance of the 
gland, if dissected out, would be more like that shown in fig. 3, 
cogl. From this diagram it will be seen that the gland consists 
of a tube which, opening posteriorly at a point to be referred to 
presently, passes forward towards the anterior end of the body 
as a simple tube, is bent upon itself, passes again towards the 
posterior end of the body, and on its way gives rise to several 
secondary tubes, which in their turn have outgrowths. The 
process of budding and division is best seen in the tubes at the 
right hand of the diagram where there are several commencing 
outgrowths, and one tube is being divided into two by numerous 
septa which pass across its lumen. 
These tubes are completely closed and are lined by an 
epithelium, to be described afterwards, except at one point 
where the wall is deficient and the lumen of the tube is con- 
tinuous with the connective-tissue spaces which everywhere 
surround the gland. (The details of this are shown in figs. 
4 to 9, and will be described later on.) 
The relations of the gland to surrounding structures approxi- 
mate pretty closely to those of the gland in the adult. There 
is, of course, no trace of the lobes which correspond to the 
coxae of the second, third, fourth, and fifth limbs, but the 
anterior end of the gland reaches as far forward as a point 
corresponding to the posterior edge of the coxa of the second 
limb, while the caecal posterior end reaches to the anterior 
edge of the coxa of the fifth limb, as is shown in fig. 3. The 
gland as a whole is straight, and lies midway between the 
lateral thickening of the entosternite (which has at this stage 
the same general form as in the adult) and an imaginary line 
dividing the body from the coxae of the limbs. As the centre 
of the gland is on a level with the plate of the entosternite the 
two lateral ridges of that structure if they were produced as 
they are in Mygale would embrace the gland, a relation which, 
as M. Pelseneer has shown in a paper recently read before the 
Zoological Society, is in Mygale actually present. The 
