Fig. 6. 
Euplectella aspergillum, a. Section of a lidge and part of wall X 15. a, dermal 
layer ; b, flagellated chambers ; c. gastral cavity ; d, handles of sword-shaped 
spicules each tipped with a floricome. b. Regular six-rayed spicule X 100. 
c. Floricome spicule X 300. (After F. E. Schulze.) 
To face p. 26. 
