12 
CHARLES BAPHAM. 
In Au strob della I shall content myself for the present 
with the appearances presented upon staining with Ehrlich’s 
hgematoxylin and eosin. By this means there are clearly 
differentiated two types of clitellar glands. The larger of 
these cells (Text-fig. 3, Cl. gl. 1), which are bowl-shaped or 
more elongated, are characterised by their large secretion 
space filled with a homogeneous substance showing a finely 
granular nature when highly magnified, and staining a light 
pink with eosin. These cells, which have an average diameter 
Text-fig. 3. 
A transverse section through the thick- walled, middle -gut region 
of Austrobdella translucens (x 40), showing the arrange- 
ment, development and character of the clitellar glands. The 
relation of the intestinal sinus to the epithelium of the thick- 
walled middle gut is shown. A portion of a segmental lacuna 
of one side is present. The blind gut has been cut at its 
narrowest part. Cl. gl. 1. Clitellar gland of the first type. 
Cy. Cytoplasm. Nu. Nucleus. Sec. s. Secretion space. 
Cl. gl. 2. Clitellar gland of the second type. Cl. gl. d. Groups 
of ducts of clitellar glands. V.ne. Yentral nerve cord. B. g. 
Blind gut. S. 1. Segmental lacuna. I. s. Intestinal sinus. 
M. g. ep. Epithelium of thick-walled part of middle gut. 
of 110 fi , have the bulk of their cytoplasm at the peripheral 
end i;n a layer, which is 30 or 40 jjl thick, and which lines, as 
it were, the secretion space, becoming finer towards the ducts. 
This cytoplasm is of very coarse structure, and the nucleus, 
wjiich is rich in large chromatin particles, has an irregular 
shape, as described by Sukatschoff in Branchellion, and is 
