PLATE XIII. 



Fig. I. Placogorgia studeri n. sp. Natural size. \a, part of branch X 5- 



Fig. 2. Placogorgia alternata n. sp. Natural size. la, part of branch X 5- 



Fig. 3. Villogorgia serrata n. sp. Natural size. 3«, part of branch X 5. 



Fig. 4. Placogorgia bebrycoides n. sp. Natural size. 4«, part of branch X 5. 



