■*#^ 



m 



Figure 6a.--Measuring sponges underwater during the field studies. Lightweight 

 Navy diving gear was used throughout, air being supplied from the surface. 



Figure 6b.— A wool sponge measured and tagged for growth studies. The brick 

 is code numbered by the notches on three of the upper edges and attached to 

 the sponge by a Monel metal wire. This sponge was on a rocky bar in the 

 northern Gulf in 20 feet of water. To the left are a number of Area clams, 

 algae, and noncommercial sponges. This is typical rock bar appearance. 



16 



