PLATE I. 



Fig. I. Plexaura aggregata n. sp. Natural size. \a, part of branch X 5. 

 Fig. 2. Plexaura attcmiata n. sp. Natural size. 2 a, part of branch >( 5. 

 P'g- 3- Plexaura pinnata n. sp. Natural size. 3«, part of branch X 5. 



