PHARYNGEAL GLAND-CELLS OF EARTHWORMS. 
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previously described. Thus in segments V and VI the main 
mass extends downwards on each side to within a short distance 
of the mid- ventral line ( cv ). An aggregate ot cells is present 
in segment VII, ventrolateral to the oesophagus on each side, 
in close association with the lateral oesophageal (“ intestino- 
tegumentary ”) blood-vessel. Similar small aggregates occur 
in segments VIII and IX. Small masses of cells are present 
dorsally in VIII, between the wall of the oesophagus and the 
dorsal vessel ; and, at least in one specimen more minutely 
examined in this connection, also dorsally on the oesophageal 
wall in IX, in the angle between the alimentary tube and 
septum 8/9; on both anterior and posterior faces of septum 9/10 
below the oesophagus ; ventrally in segment X in association 
with a blood-vessel ; and on the wall of the oesophagus below 
the dorsal vessel at the level of septum 10/11. 
The Chromophil Cells. — (PI. 19, fig. 8). — The cells are 
oval or irregular in shape, a small one measuring 9 jjl, a 
large one 18 fi in greatest length. They do not fit closely 
together ; the interspaces are empty or contain an inter- 
cellular matter. 
The nucleus is large and conspicuous, vesicular, spherical 
or ovoid, 4 /ul — 6 /u in longest diameter, often peripher- 
ally situated, and clearer than the stained cytoplasm around 
it. Besides small grains of chromatin there is a large 
nucleolus, of different material from the chromatin grains, the 
central portion of a bluish tinge in alcoholic iron-hsema- 
toxylin preparations, the periphery darker and more opaque. 
This large nucleolus may be absent; and then the deeply 
staining chromatic granules are alone visible, of which one 
may be larger than the rest. 
The cell-body contains masses of deeply-staining material, 
the remainder of the cytoplasm being more slightly coloured. 
The less deeply staining areas are more peripherally situated ; 
the more densely coloured portion usually encloses the 
nucleus, and on the whole is more central in position; it may 
be prolonged in one or other direction as fibril -like strands. 
The intercellular substance is not as a rule sharply 
