196 Reid . — Notes on the Geological History 
POTAMOGETON PERFQLIATUS, Linn. 
Drupes. Interglacial, Kilmaurs, Redhall, Hailes, and Cow- 
den Glen. 
POTAMOGETON CRISPUS, Linn. 
Drupes, and occasionally spikes of fruit. Preglacial (Cromer 
Forest-bed), at various localities. 
POTAMOGETON PUSILLUS, Linn. 
Drupes. Interglacial, Redhall, Hailes, and Cowden Glen. 
POTAMOGETON TRICHOIDES. 
Drupes. Preglacial (Cromer Forest-bed), abundant at 
several localities. 
POTAMOGETON PECTINATUS, Linn. 
Drupes. Interglacial, Cowden Glen. Preglacial (Cromer 
Forest-bed), common at most localities and often very large. 
Zannichellia palustris, Linn. 
Achenes. Interglacial, Kilmaurs, one specimen received 
from Mr. John Young. Preglacial (Cromer Forest-bed), 
abundant. At Pakefield a remarkably spinose form occurs. 
Eleocharis palustris, R. Br. 
Nuts. Interglacial, Hailes and Redhall. 
SCIRPUS PAUCIFLORUS, Lightf. 
Nuts. Interglacial, Redhall, Hailes, and Stair. Preglacial, 
at several localities. 
It is not easy to distinguish S. panciflonis from certain 
species of Carex> in the absence of the utricle ; it is possible 
that some of the specimens referred to Scirpus may belong 
to Carex. 
Scirpus caespitosus, Linn. 
Nuts. Preglacial, abundant at various localities. 
Scirpus fluitans, Linn. 
Nuts. Preglacial, occasionally found at Beeston. 
