C. scutellum Ehib. 



Frequent throughout the island. 



NAVICULA Bory. 

 N. Americana Ehrb. 



Xings : Coney Island, Woodman. 

 N. ambigua Ehrb. ' 



Kings : Prospect Park. 

 N. Apis Kiitz. 



Kif?gs : Coney Island, Woodman. 

 N. clavata Griin. 



Queens : Arverne, Edwards. 

 N. flamma A. Schm. 



Kings : Prospect Park. 

 N. cuspidata Kiitz. 



Frequent throughout the island. 

 N. didyma Ehrb. 



Queens : Arverne, Edwards. 

 N. dilatata Ehrb. 



Brooklyn Water Supply. 

 N. elHptica Kiitz. 



Queens : Arverne, Edwards. 

 N. firma Kiitz. 



Kings: Prospect Park, Coney Island,, Woodman. 

 N. laevissima Kiitz. 



Kings : Prospect Park. 

 N. gibba (Kiitz.) Ehib. 



Brooklyn Water Supply. 

 N. Hennedyi AV. Sm. 



Queens : Arverne, Edwards. 

 N. Hitch cockii Ehrb. 



Kngs: Prospect Park. 

 N. Indica Grev. 



Queens : Arverne, Edwards. 

 N. lacustris W. Sm. 



Queens : Arverne, Edwards. 

 N. lata Breb. 



Kings : Coney Island, Woodman. Queejis : Arverne, Edwards, 

 N. Lyra Ehrb. 



Not infrequent around the coast. 

 N. major Kiitz. 



Kings : Prospect Park. 

 N. peregrina (Ehrb.) Kiitz. 



Queens : Arverne, Edwards. 

 N. permagna Bailey. 



Queens : iVrverne, Edwards. 



