114 



SPONGES 



ffm 



sd tn 



Fio. 78. 



Section of tlie body wall of Bathydorus fimbriatus, F.E.S. The spicules are omitted from 

 the drawing. x30. (After F. E. Schulze.) ejc.c, excurrent canals. Other letters as in Figs. 

 70, 77. 



fflTL 



Fi(i. 79. 



Section of the wall of 7"a*j7fna pu/<r/irn, F.K.S. The spicules are omitted. x20. (After K. 

 E. Schulze.) The letters a:) in tlie three preceding llgures. 



. i 



