454 University of California Publications in Zoology [Vol. 22 



IV. CONCLUSION 



Twelve female and nine male specimens of Oithona. nana Gies- 

 breclit were reared from egg to adult. Six naupliar and five eope- 

 podid stages were definitely established in each specimen. 



These rearing experiments warrant the following suggestions: 



(1) Some of the hardier marine copepods may be reared without- 

 expensive apparatus and methods. 



(2) Accurate record may be kept of single individuals. 



(3) Results may be given in form available for practical use in 

 enumeration of the zooplankton. 



