10 
CHARLES BADHAM. 
The relations of the nerve ganglia, male and female 
openings, and the male glands to the neck annuli are shown 
in Text-fig. 2. 
The Epidermis. 
The cuticle is thin, 2 ju or less in thickness. The cells 
of the epidermis are irregularly cubical in shape, measuring 
about 8 fji. Towards the anterior and posterior suckers they 
become more cylindrical and have a length of 14 fx by 5 /u 
wide. On the ventral surface towards the median plane these 
epidermal cells are not so numerous. But a few of them are 
slightly enlarged and converted into gland cells with ducts 
opening on the surface. 
Hypodermal Glands. 
There is developed on the lateral margin of the main body 
region, partly surrounding the contractile lacuna, a remark- 
able layer of cells, three or four deep and of great size 
(PI. 2, fig. 9, L.gl.). Each is a unicellular gland and its 
duct opens on the ventral surface. The largest of these cells 
has a diameter of 63 fi and the size ranges from this to about 
15 fj.. The shape varies considerably, but in all the secretion 
space passes gradually into the duct, which has a very small 
lumen. 
The nucleus varies a good deal in appearance ; generally it 
is more or less spherical, but frequently elongated and 
twisted ; it has many chromatin particles staining heavily 
with haematoxylin. 
These glands appear to correspond to certain cells, not so 
well developed, called the lateral glands in Branchellion 
by Sukatsehoff (1912). 
As is general in Ichthyobdellids, both mucous and albu- 
minous unicellular glands are present in the two suckers. 
In the oral sucker the albuminous glands are arranged 
around the dorso-lateral three-fourths of the sucker. They 
are placed inside the circular and longitudinal musculature of 
