PHARYNGEAL GLAND OF THE EARTHWORM 61 
Fig. 3.—Epithelial and subepithelial portion of the pharyngeal bulb, 
showing the salivary or mucin ducts (d. mu.) dividing into a multitude of 
fine ductules (d7. mu.), which penetrate between the cells of the pharyngeal 
epithelium and terminate in the discharge pockets (d. p.) lying beneath the 
cilia (c7.) of the epithelial cells. x 562. 
Fig. 4. —Glandular or salivary portion of the pharyngeal bulb, showing 
granules of mucin within the cells. x 825. 
Fig. 5.—Portion of the pharyngeal bulb showing the transition between 
the glandular and the conductive regions. The mucin-secreting, basophile 
cells are widely separated by strands of mucin. x 825. 
Fig. 6.— Conductive portion of the pharyngeal bulb, showing the mucin 
ducts (d.mu.), muscles (m.), and blood-vessels (v.). x 825. 
Fig. 7.— Epithelial portion of the pharyngeal bulb of All. foetida 
stained by the Thionin method. Section similar to that of AII. 
chlorotica represented by fig. 3, but with mucin stained red. x 562. 
Fig. 8.—Portion of the pharyngeal epithelium of All. foetida 
showing the emission of mucin from the discharge pockets into the pharyn- 
geallumen. x 825. 
Fig. 9.—Section of the glandular portion of the pharyngeal bulb of 
All. foetida showing the basophile cells filled with mucin. x 825. 
Fig. 10. - Portion of the skin of All. foetida showing the mucin 
cells. x 825. 
