OwEN; on the Surface-fauna of Mid- ocean. 119 
taining the most brilliant phospliorescent Entomostraca that 
I have met with. (See figs. 1, 2, 3.) When these were taken 
the sea was alive with them. When 
swallowed by or entangled with other 
creatures they in their turn appear to 
be also luminous. They also give lumi- 
nosity to the water itself as it flows over 
them. When they are at rest they 
gradually cease to give out light but 
as soon as they are disturbed or in 
motion^ or the vessel containing them 
is shaken^ they again become bright^ 
even after many hours' confinement. 
Each of these specimens I picked out 
while phosphorescent^ that there might 
be no mistake about the giver of light. 
The nearest of the Entomostraca 
that I have been able to compare with 
these is the species Gibbosa, genus Cypridiua^ of the order 
Astrucoda^ named and figured by Dana. He reports having 
found his specimens in the Pacific, in lat. 15° 20^ south, 
Fi-. 3. 
and long. 148° west. He notes them as very brilliant.'' 
My specimens from which these drawings are taken Avere 
caught in the month of November, in the Bay of Bengal, 
in lat. 3° north, and long. 90° east. There is no reason why 
such things should not have a wide range. It may, there- 
