ANTIIOZOA. 
71 
Full-grown corals are not always huge masses ; they may be of 
great delicacy and beauty, as is shown by Fig. 18, which represents 
Triclacophyllia mankind , and by the three succeeding figures, which 
represent various deep-sea corals, Case 8b. The discovery of life at 
great depths — depths as great as the heights of some of the highest 
mountains of the world — was one of the most interesting discoveries 
of the second half of the last century, and has led to a great increase 
in our knowledge of the globe we inhabit. 
