•6 Lessons in Zoology. 



spoDge. We put the probes into the small holes, and 

 find small tubes (Fig. 1, b) leading from some of them 

 to the large tubes ; from others, cross -tubes (Fig. 1, c) 



Fig. 1. Vertical sectiou ul glove spouge ifum Nassau, hliown with 

 the flesh 



connecting one small tube with another. Some of these 

 connecting tubes in process of formation show plainly as 

 channels on the surface, only partly covered in as yet by 

 little bridges of fibres. Besides these tubes, there are 

 others so small that we cannot trace them out (Fig. 1, d) 

 passing in every direction through the mass of fibres. 



A short talk about the home of the spun^t^s euds the lesson. 



