452 GEOLOGICAL SURVEY OF NEW JERSEY. 



DIMEREGRAMMA, Ralfs. 



D. marinum (Greg.), Ralfs. 



Marine. Monmouth : Rare in mud at the mouth of Shark 

 River. 



RHAPHONEIS, Ehrb. 

 R. Amphiceros, Ehrb. 



Marine. Common all along the coast in the mud at the 

 mouths of rivers and inlets and in tidal pools. 



Var. rhombica, Grun. 



Cape May : Occasional in brackish water of Dennis Creek. 



SYNEDRA, Ehrb. 

 S. affinis, Kiitz. 



Marine and brackish water. Ocean : Very common in Bar- 

 negat Bay. Cape May : Marshes near Cape May Lewis. 



Var. tabulata (Kiitz.), V. H. (S. tabulata, Kiitz.) 



Marine and brackish water. Cape May : Common near Cape 

 May. 

 S. capitata, Ehrb. 



Fresh water. Sussex : Hewitt's Pond near Andover. Mor- 

 ris : Fossil in the Drakesville deposit. 



S. fulgens (Kiitz.), W. Sm. 



Marine. Abundant on marine algae. Monmouth : Shark 

 River, Manasquan River, Shrewsbury River. Ocean : Barnegat 

 Bay. 

 S. grracilis, W. Sm. 



Marine. Common all along the coast Lewis. 

 S.(?) nitzschioides, Grun. (Thalassiothrix, Grun.) 



Marine and brackish water. Monmouth : Occasional in 

 brackish water of Lake Como. 

 S. pulchella, Kiitz. 



Fresh water. Abundant on water plants. Monmouth : Lake 

 Como. Sussex : Andover. Burlington : Marlton. 



Var. Smithii, Ralfs. 



Fresh water. Common on water plants. Same localities. 



