438 GEOLOGICAL SURVEY OF NEW JERSEY. 



N. follis, Ehrb. 



Fresh water. Atlantic : Frequent in ponds at HammontoD 

 and Absecon. 



N. forcipata, Grev. 



Marine. Frequent on the sands between tide marks and in 

 salt-water ditches. Monmouth : Shark River, Manasquan 

 River, Ocean Beach clay. Atlantic : Atlantic City. 



N. fortis, Greg. 



Marine. Atlantic : Common in meadow pools near the inlet 

 at Atlantic City. 



N. gibba (Kiitz.), Ehrb. 



Fresh water. Common in ponds and streams. Monmouth : 



Ocean Beach, Lake Como. Sussex : Culver's Gap, Branch ville. 

 Atlantic : Absecon. 



N. gracilis (Ehrb.), Kiitz. 



Fresh water. Sussex : Occasional in a pond near Hamburg. 

 N. granulata, Breb. 



Marine. Monmouth : Occasional on sand flats at the mouth 

 of Shark River and of Manasquan River ; Ocean Beach clay. 

 Atlantic : Atlantic City. 



N. Hennedyi, W. Sm. 



Marine. Monmouth : Occasional in Shark River and Mana- 

 squan River ; fossil in Ocean Beach clay. Camden : Fossil in 

 the blue clay of the Delaware River at Camden Lewis. 



N. Hitchcockii, Ehrb. 



Fresh water. Camden : Rare, in Kirkwood Pond. 

 N. humerosa, Breb. 



Marine. Monmouth : Common between tide marks in Shark 

 River and Manasquan River ; fossil in Ocean Beach clay ; also 

 at Long Beach, on algae Lewis. 



N. Indica, Grev. 



Marine. Monmouth : Occasional in ditches near the mouth 

 of Manasquan River ; fossil in Ocean Beach clay. 



N. inflexa, Greg. 



Marine. Monmouth : Abundant in sand ripples at the mouth 

 of Shark River. 



