Order Pediculati: The Anglers 751 
simple, very small lamella at the extremity (Melanocetus john- 
sont, Melanocetus murrayi). In other forms sometimes a 
Fig. 665.—Deep-sea Angler, Ceratias holbolli Kréyer. Greenland. 
Fie. 666.—Caulophryne jordani Goode & Bean. Gulf Stream. Family Ceratiide. 
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 
