Z/L graph — A graph used to determine in situ 

 depths of oceanographic observations by the 

 thermometric depth versus wire depth ratio 

 method. 



ZoBell bottle — A sterile bottle constructed to col- 

 lect sea water samples at a desired depth for bac- 

 teriological analysis. Multiple sampling can be 

 accomplished in a manner similar to an oceano- 

 graphic cast. 



zoea — An early larval form of certain decapod 

 crustaceans. (26) ^ee decapod. 



zonal flow — Currents or winds moving east or 

 west along a latitude. (32) 



zone time — The local mean time of a reference or 

 zone meridian whose time is kept throughout a 

 designated zone. The zone meridian is usually 



the nearest meridian whose longitude is exactly 

 divisible by 15 degrees. 



zoogene — The environment and deposits char- 

 acterized by abundant lime-secreting organisms, 

 such as reefs. (2) 



zooplankton — The animal forms of plankton. 

 They include various crustaceans, such as cope- 

 pods and euphausiids, jellyfishes, certain proto- 

 zoans, worms, mollusks, and the eggs and larvae 

 of benthic and nektonic animals. They are the 

 principal consumers of the phytoplankton and, 

 in turn, are the principal food for a large num- 

 ber of squids, fishes, and baleen whales. 



zooplankton equivalent — See plankton equiva- 

 lent. 



207-109 O - 66 - 13 



187 



