112 THREE CRUISES OF THE / BLAKE." 
a temperature of over 80” Fahr., which decreases gradually with 
the depth, till, between 600 and 700 fathoms, it has fallen to 
Fig. 395. — Ophioconis miliaria. $. 
394°. The American continents on one side, and the Antilles 
Fig. 396. — Ophiomusium planum. 1,5, 
rhood 
on the other, furnish those great land masses the neighbo 
Their 
of which seems essential to rich and varied marine life. 
