274 MR. w - A - NICHOLSON ON BOTANY OF SUTTON. 
Rooted forms include, the Batrachian Ranunculi, 
R. circinatus, Sibth. 
R. peltatus, Schrank. 
R. HEDERACEUS, L. 
The Batrachian Ranunculi are, doubtless re- 
presented by several more species in the district. 
Myriophyllum verticillatum, L. 
Sparganium minimum, Fr. 
This occurs in some abundance in a dyke near the 
Laboratory. 
POTAMOGETON POLYGONIFOLIUS, Pour. 
P. ALPINUS, Balb. 
P. LUCENS, L. 
P. PRAELONGUS, Wulf. 
P. PERFOLIATUS, L. 
P. CRISPUS, L. 
P. zostercefolius, Schum. 
P. OBTUSIFOLIUS, M. & K. 
P. Friesii, Rupr. 
P. PUSILLUS, L. 
Charace.e, see preceding list. 
Note. — Najas marina, L., has only been found in Britain in the Hickling 
District. It was first discovered in Pickling Broad, by Mr. A. Bennett, in 18 S 3 . 
The fourth type of aquatic plants is Schimper’s Hydro- 
charis-type, “ free-swimming with short shoots.” 
Quite submerged, there are : — 
Lemna trisulca, L. 
Greater part submerged : — 
Stratiotes Aloides, L. 
Greater part floating on the surface . — 
Hydrocharis Morsus-ranae, L. 
Lemna minor, L. 
RlCCIOCARPUS NATANS, L. 
Of the fifth, or Podostemon type, consisting of submerged 
plants fixed to stones in running water, I can say but little. 
I presume Fontinalis antipyre-tica, L. (a fragment of which 
was found by Mr. Burrell at Sutton) would represent this type. 
Of the Podostemaceie, in general, Professor S. H. Vines 
