CATALOGUE OF PLANTS. 441 
N. producta, W.Sm. 
Fresh water. Atlantic: Common in Absecon Pond. 
N. pusilla, W. Sm. 
Fresh or brackish water. Atlantic: “Brackish ditches near 
Absecon and Pleasantville. Cape May: Ditches near Cape 
May. 
N. radiosa, Kiitz. 
Fresh water. Sussex: Frequent in ponds and ditches at 
White Hall, Andover, and in the Musconetcong River at Water- 
loo. 
Yar. acuta, V. H. 
Fresh water. Gloucester: Common in ponds and ditches at 
Mullica Hill. Sussex: White Hall and Andover. Morris: 
Lake Hopatcong and Drakesville fossil deposit. 
N. retusa, Breb. 
Marine. Monmouth : Occasional between tide marks at the 
mouth of Shark River. 
N. rhomboides, Ehrb. 
Fresh water. Generally distributed throughout the State. 
Atlantic: Occurs in enormous quantities upon Utricularia and 
other water plants in ponds at Hammonton, Absecon and Mays 
Landing. Ocean: Toms River, and Cape May: Dennisville. 
Particularly plentiful in cedar-swamp bogs and streams. 
Var. crassinervis, Breb. (Frustulia Saxonica, Rab.) 
Fresh water. Abundant in the same localities as the last- 
named species. 
N. rhyncocephala, Kiitz. 
Fresh water. Camden: Occasional in the pond at Kirkwood, 
and Atlantic: In the water from the artesian well at Atlantic 
City. 
N. Schweinfurthii, A. 5. 
Fresh water. Burlington: Occasional in old marl-pits at 
Marlton. 
N. semen, Ehrb. 
Fresh water. Burlington: Common in old marl-pits at 
Marlton, and Gloucester: Mullica Hill. 
