60 D. KEILIN 
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EXPLANATION OF PLATE 3. 
Illustrating Dr. Keilin’s paper: ‘On tbe Pharyngeal or 
Salivary Gland of the Earthworm. ’ 
Key to Lettering on Plate. 
el. = cilia. 
cu. = cuticle. 
dl. mu. = intra-epithelial mucin ductules. 
d. mu. = mucin ducts. 
d. p.= mucin discharge pockets, 
e. gl. = enzyme-secreting glandular cells. 
m. = muscles. 
m. gl. = mucin-secreting pharyngeal, or salivary cells. 
mu. = mucin. 
mu. c.= mucin cells of the skin. 
v. = blood-vessels. 
ur. = crystals of uric acid or bacteroids. 
Figs. 1 to 6 concern Allolobophora chlorotica Sav. All the 
sections were stained with the Mucihaematein of P. Mayer, and Magenta-red 
and Picro-Indigo-carmine (see pp. 38-9 of this paper). 
Figs. 7 to 10 represent sections of Allolobophora foetida stained 
by the Thionin method (see pp. 38-9 of this paper). The nuclei of the cells 
are of a dark-blue colour, not purple as shown in these figures. 
Fig. 1.—Section of the skin of All. chlorotica, showing mucin cells 
(mu. c.) in different stages of activity. x 825. 
Fig. 2.—Deep glandular portion of the pharyngeal bulb showing the 
mucin-secreting salivary cells (m. gl.)and the enzyme secreting-cells (e. gi.). 
x 825. 
