CATALOGUE OF PLANTS. 437 



N. cryptocephala, Kiitz. 



Fresh water. Frequent in ponds and ditches. Gloucester : 

 Mullica Hill, Woodbury. Burlington : Marlton. Sussex : 

 Hamburg, Andover, White Hall. 



N. cuspidata, Kiitz. 



Fresh water. Common in meadow ditches. Camden : Laurel 

 Mills, Kirk wood, Gloucester. Salem : Woodstown, Sharptown. 

 Burlington : Marlton. 



N. cyprinus (Ehrb.), W. Sm. 



Marine. Monmouth : Occasional in Manasquan River. At- 

 lantic : Common at Atlantic City, and Cape May : Lewis. 



N. didyma, Ehrb. 



Marine, Monmouth : Common in Manasquan and Shark 

 Rivers ; Ocean Beach clay. Cape May : Ditches near Cape 

 May Lewis. 



N. dilatata, Ehrb. 



Fresh water. Common in ponds throughout the State. 

 Fossil at Drakesville. 



N. divergens, W. Sm. 



Fresh water. Burlington : Frequent in old marl-pits near 

 Marlton. 



N. elegans, W. Sm. 



Brackish water. Common in pools on the salt marshes. 

 Monmouth : Shark River. Atlantic : Absecon. 



N. elliptica, Kiitz. 



Salt, brackish or fresh water ; common. Monmouth : Mana- 

 squan River, Shark River ; Ocean Beach clay. Camden : 

 Camden water-supply. Gloucester : Mullica Hill. Salem : 

 Woodstown, Sharptown. Burlington : Pemberton, Marlton. 

 Cape May : Ditches near Cape May Point, Dennis Creek. 



N. firma, Kiitz. 



Fresh water. Common in ponds throughout the State. 



Var. subampliata, Grim. 



Fresh water. Atlantic : Frequent in the pond at Hammon- 

 ton, and Monmouth : In Lake Como. 



