THE PRE-GLACIAL FLORA OF BRITAIN. 213 
We require more material for the determination of this interesting seed, 
which belongs to no living water-lily of which we have vet been able to 
examine seeds. 
МүмрнжАСЕЖ sp. 4. (Pl. 11. fig. 16.) 
Two or three much damaged seeds that appear to belong to a fourth species 
of water-lily have been found at Pakefield. Length 4:3 mm.; testa with 
eonspieuous rectangular pits arranged in lines. These also must wait for 
further material. 
HYPECOUM PROCUMBENS, Linn, (РІ. 11. fig. 17.) 
Seeds of this plant are common at Corton and correspond exactly with 
those of the recent plant, which belongs to the Mediterranean region and 
Southern France. 
All the species of this genus have the seed protected by a close mosaic of 
cubic erystals of oxalate of lime. These impress the testa with quadrangular 
pits ; and traces of these thin-walled quadrangular pits are to be found on 
several of our specimens. 
VIOLA PALUSTRIS, Linn. (Pl. 11. fig. 18.) 
Damaged seeds of Viola are common at various localities, but are seldom 
sufficiently well preserved for determination. Fig. 18 corresponds with 
Viola palustris. 
VIOLA, cf. HIRTA, Linn. (РІ. 11. figs. 19, 20.) 
Many of the seeds of Viola belong to a larger form, closely resembling 
V. hirta, but slightly more slender than our recent seeds of that species. 
Утог, cf. RIVINIANA, Reichb, (Pl. 11. fig. 21.) 
The majority of the seeds of Viola belong to a third species. They closely 
resemble V. Aüviniana, but are larger than our recent seeds. 
STELLARIA AQUATICA, Moench. (PI. 11. fig. 22.) 
S. MEDIA, Villars. (PI. 11. fig. 23.) 
$. НогоѕтЕА, Linn. (РІ. 11. fig. 24.) 
These correspond so exactly with the recent seeds that no remark is needed. 
They were all found at Pakefield. 
ARENARIA SERPYLLIFOLIA, Linn. (РІ. 11. fig. 25.) 
One perfect seed and one fragment are all that we have found of this 
species. 
ELATINE HYDROPIPER, Linn. (Pl. 11. fig. 26.) 
Several seeds have been found at Pakefield. 
LINN. JOURN,—BOTANY, VOL. XXXVII, Q 
