216 



EVOLUTION AND GENETICS 



different from those in which we Hve should produce organisms 

 which are, from our point of view, bizarre (Fig. 127). Strange 



Fig. 127. — Deep-sea fishes. A, Photoslomias guernei, length 1.5 inches, taken 

 at a depth of 3500 feet; B, Idiacanthus ferox, 8 inches, 16,500 feet; C, Gas- 

 trostomns bairclu, 18 inches, 2300-8800 feet; D, Cryptopsaras coucsii, 2.25 

 inches, 10,000 feet; E, F, Linophryne lucifer, 2 inches. (From Lull, after 

 Goode and Bean.) 



body forms prevail, and luminescence is common. The purpose of 

 luminous organs seems usually to be the attraction of prey or the 

 provision of Ught for their possessor, but Beebe, in The Arcturus 



