CATALOGUE OF PLANTS. 41] 
P. Ehrenbergii (Corda), A. Br. 
Frequent in pools. 
P, tetras, Ehrb. 
Same habitat. 
C@LASTRUM, Neg. 
C. Cambricum, Arch.* 
In ponds. 
C. microporum, Neg. 
Same habitat. 
Sub-Class 4.-CONJUGATZ. 
MESOCARPE. 
MESOCARPUS, Hass. 
M. scalaris (Hass.), De By. 
In marsh and meadow pools; frequent. 
M. nummuloides, Hass. 
In similar localities. 
PLEUROCARPUS, A. Br. 
P. mirabilis, A. Br. 
In pools; very common; sterile. 
STAUROSPERMUM, Kutz. 
S. Capucinum, Kiitz. 
Burlington: Atsion, Pleasant Mills, and generally frequent in 
ponds. 
S. quadratum, Kitz. 
Morris: Budd’s Lake, and other ponds. 
* Replaces P. sphericum of the Preliminary Catalogue. C. Neegelii of that cata- 
Jogue is not now regarded as a New Jersey plant. ~ 
