548 Order Pediculati: The Anglers 
brought to the surface. In their habits they probably do not 
differ in any degree from their surface representative, Lophius. 
Fic. 498.—Deep-sea Angler, Ceratias holbolla Kroyer. Greenland. 
The number of the dorsal spines is always reduced, and at the 
end of the series of these species only one spine remains, with a 
simple, very small lamella at the extremity (Melanocetus john- 
Fia. 499.—Caulophryne jordani Goode & Bean. Gulf Stream. Family Ceratiide. 
sonit, Melanocetus murrayi). In other forms sometimes a 
second cephalic spine, sometimes a spine on the back of the 
trunk, is preserved. The first cephalic spine always retains 
the original function of a lure for other marine creatures, but 
to render it more effective a special luminous organ is sometimes 
