CTF.NUPHORES IX NEW JERSEY COASTAL WAN RS. 



97 



l.i-i-n made l.y nets, by traps, and, perhaps best of all where they 

 scarce, by running a motor boat at night and counting the 

 number of individuals flashing in the wake of the boat. Much 

 of the region covered by these observations is so shallow that the 

 disturbance from a launch's propellor reaches quite to the bottom. 



2. Young Mttftniopsis 5 mm. long in the Pleurobrachia stui;<- .-Imwing re- 

 tracted tentacles. 



In Table I. a summary is given of our observations of Mnenii- 

 f/'.s/.v for the past six years. 



r.ainegat Hay (</. Nelson, '23/1) is a shallow estuary with an 

 average tidal fluctuation of 4-6 inches. It therefore warms up 

 rapidly in the spring and presents during the summer subtropical 

 temperature conditions. The temperature of the water on June 

 21, tlu- date of the first appearance of Mnemiopsis here in IQJ.V 

 raii^rd from 24.5 to 26.1 C. at 7 stations. The specific gravity 

 \atied between 1.0117 and 1.0152. The ctenophores which 

 -\\armed in the waters of the bay during July, August and 

 Si-pu'inber were mostly of medium or of large >i/e. 



A- the temperature fell with early autumn particular attention 

 was paid t<> the stage of development of the animals. All 

 -pecimeii> taken October 6, at a temperature of 14 C.. were 



