PHARYNGEAL GLAND OF THE EARTHWORM AT 
the muscle fibres (m.) and blood-vessels, are seen to become 
parallel to each other and perpendicular to the epithelium. 
Reaching the basal membrane of the latter, these salivary 
ducts give off numerous small ductules (dl. mu.) which penetrate 
between the epithelial cells and terminate separately mm a 
multitude of small pockets (d. p.) of mucin lying immediately 
TEXT-FIG. 4. 
i} 
Section of the ciliated pharyngeal epithelium of All. foetida 
(stained with Mucihaematein only, showing the intra-epithelial 
mucin ductules = dl. mu., ending in the discharge pockets = d. p. ; 
ce cilia) >< 750! 
beneath the free surface at the base of the cilia. These fine 
ductules, with the terminal discharge pockets, are very clearly 
seen in sections stamed by Mucihaematein alone (Text-fig. 4), 
or combined with Magenta-red, Picro-Indigo-carmine, or by the 
Thionin method. In the first two cases they are all stained 
violet while the surrounding protoplasm is either unstained or 
greenish yellow in colour (Pl. 3, fig. 3), im the second case 
(ex. All. foetida) these ductules are red, while the rest of the 
