Figure 4. A 5- to 6-foot-long shark-like fish with a large dorsal fin, 

 on the sea floor in 5,300 feet of water. (Courtesy of Carl 

 Shipek of the U. S. Navy Electronics Laboratory.) 



Figure 5. Photomicrograph of colonial (encrusting) bryozoa, deep-sea 

 glass sponge, Foraminifera, and worm tubes on a rock 

 surface (magnified). 



