SCYPHOZOA 



239 



Order i. The Stauro medusae are a small group in which the sense 

 organs are wanting. There is usually an aboral stalk for attachment. 



Order 2. The Lobomedusae are free swimming medusae with sense 

 organs (tentaculocysts) in the notches between the lobes of the umbrella. 



FIG. 135. A small sea fan (Gorgonia) and a group of finger sponges. X 1/3. 



529. Class IV. Anthozoa. The Anthozoa comprise the sea 

 anemones and corals. In this group the medusa stage is want- 

 ing and the polyps are either solitary and comparatively large 

 or smaller and colonial. They are especially abundant'in the 



