ee) 
~ 
OF THE SOFT PARTS IN EUPLECTELLA ASPERGILLUM. 6 
EXPLANATION OF PLATE XVII. 
. Part of the outer surface of the tube-wall of Huplectella aspergillum, from the Zebu specimen 
preserved in absolute alcohol. Natural size. 
. Part of the inner surface of the tube-wail of the same sponge. Natural size. 
. Transverse section of a ridge, with part of the tube-wall of the same sponge. The section 
corresponds to one of the larger efferent openings of the exhalent canal system. x 16. A 
combination figure. 
. Outer portion of a thin section taken perpendicularly to the outer surface through the side watl 
of aridge. x 150. 
. External view of a small piece of the outer membrane from the side wall of a ridge. x 400. 
. Transverse section of a layer of ciliated chambers with a sperm-sphere. x 400. 
, Part of the wall of a ciliated chamber. x 600. 
. A small portion of the network of the exhalent lacunar system of a ridge. x 610. 
MOL, XNIXs PART EL: (Ca 
