Fig. i8. — Pheronema raphanus^ the Indian Bird's-nest Sponge; from the 

 Andaman Sea, 173-405 fathoms ; reduced. 



Fig. 19. — Flahellum laciiiiatimi , the deep-sea fan-coral, found in all 

 parts of the Indian Seas at 400-600 fathoms. The same species has been 

 dredged in the depth of the North Atlantic, and occurs as a fossil in the 

 Tertiary rocks of Southern Europe. 



\To face page 146. 



