256 FRANK E. BEDDARD. 
ing bodies which I take to be nuclei. There is, however, no 
trace of cell limitations corresponding to the nnclei. The 
whole gland is covered with a darkly staining but thin sheath. 
Through the middle of the gland runs a stout blood-vessel, 
which I found to be nearly everywhere filled with coagulated 
blood. Its track through the gland was therefore not difficult 
to follow. The blood-vessel runs through the gland from end 
to end, but gives off very few branches; it is, however, of 
such great width as compared with the gland that any branch- 
ing seems to be unnecessary for the adequate blood-supply of 
the surrounding tissue. The vessel belonging to each gland 
could be traced in three directions. Anteriorly it leaves the 
gland, and traversing the septum becomes the blood-vessel of 
the corresponding gland of the segment in front. Posteriorly 
the same thing happens. The successive glands of one side of 
the body are therefore, as it were, strung upon a continuous 
lateral vessel. In the middle of each gland a large branch 
arises from this which communicates with the plexus round 
the cesophagus. In the case of the last pair of glands, those 
belonging to the 12th segment, I observed two such branches 
communicating with the peri-cesophageal blood-plexus of which 
one was distinctly smaller than the other. Nearly the whole 
of the gland is made up of the peculiar tissue described and 
illustrated in figs. 12—15. In places where the gland was 
very slender in dimensions, this tissue has taken on a decided 
resemblance to columnar epithelium, faint lines of demarcation 
between the cells being apparent. Here the appearance pre- 
sented is that of a tubular gland, but the lumen of the gland 
is filled with blood. Although these structures are solid, 
excepting for the blood-vessel which occupies so large a por- 
tion of their interior, they are not without communication 
with the gut. Transverse sections show the nature of their 
connection with the cesophagus better than longitudinal sec- 
tions. A transverse section is illustrated in fig. 12. On the 
ventral surface of the cesophagus a pair of moderately long 
cellular tubes arise close together from the lining epithelium 
of the alimentary tract. These diverge, and each follows the 
