Chap. 31 



MOLLUSKS SPECIALISTS IN SECURITY 



649 



Fig. 31.16. The common squid (Loligo pealii) photographed in an aquarium at 

 Marine Biological Laboratory, Woods Hole, Massachusetts. Length, about ten 

 inches. (Courtesy, General Biological Supply House, Chicago, 111.) 



Fig. 31.17. A school of bioluminescent deep-sea squids (Watasenia scintillans) 

 as it might appear in the darkness of the deep sea. An actual observer said of one 

 tropical species of squid that the eyes shone blue, the sides of the body with pearly 

 sheen, and the underside of the body crimson. The common squid {Loligo pealii) 

 is not bioluminescent. (Courtesy, American Museum of Natural History, New 

 York.) 



