CCELENTERATA. 
253 
Fw. 201.—.3 tadrepora axpera, living and expanded; natural size. Pacific. 
whose mean temperature in the coldest month is below 
68° Fahr., nor at greater depth than twenty fathoms. The 
most luxuriant reefs are in the Central and Western Pa¬ 
cific and around the West Indies. 
Fig. 202 .—Ctenactis echinata , or “ Mushroom-coralone fourth natural size. Pacific. 
