460 GEOLOGICAL SURVEY OF NEW JERSEY. 
C. spiralis, W. Sm. 
Fresh water. Rare in the blue clay of the Delaware River at 
Philadel phia— Lewis. 
NITZSCHIA, Hass. 
N. Amphioxys, W. Sm. 
Fresh water. Common in ditches and meadows. 
N. angularis, W. Sm. 
Fresh water. Camden: Delaware River mud—Lewis. 
N. birostrata, W. Sm. 
Marine. Generally distributed along the coast—Lewis. 
N. Closterium (Ehrb)., W. Sm. 
Marine. Monmouth: Very abundant on flats at the mouth 
of Shark River and at the mouth of Manasquan River. 
N. curvula, W. Sm. 
Fresh water. Atlantic: Occasional in ponds at Hammonton 
and Absecon, and Ocean: Toms River. 
N. dubia, W. Sm. 
Brackish water. Atlantic: Marshes near Absecon. Mon- 
mouth: Marshes near Shark River. 
N. elongata, Hantzsch. 
Fresh water. Gloucester: Occasional in Mullica Hill Pond. 
N. epithemioides, Grun. (Amphiprora latestriata, Breb.) 
Marine. Atlantic: Very abundant in a tidal pool near the 
inlet at Atlantic City. 
N. fasciculata, Grun. (Homeocladia sigmoidea, W. Sm.) 
Brackish water. Salem: Abundant in brackish ditches near 
Salem. Atlantic: Marshes near Absecon. Monmouth: Marshes 
near Shark River. a 
N. Heufleriana, Grun. F 
Fresh water. Morris: Rare in the Drakesville deposit. 
N. hybrida, Grun. (N. bilobata, W. Sm., var.?) 
Marine. Monmouth: Occasional at the mouth of Shark 
River. 
