MR. W. G. CLARKE OX BRECKLAND CHARACTERISTICS. 575 
SUFFOLK. 
Coast 
Plants. 
Coast 
Insects. 
Coast 
Birds. 
Barnham Heath 
t 
■ „ 
+ 
Culford Heath ... 
t 
— 
— 
Euston Warren ... 
+ 
— 

Icklingham Plains ... 
t 
t 
— 
Knettishall Heath 
+ 
— 
I.akenheath Warren - 
t 
t 
t 
Session Heath, Brandon 
t 
t 
Santon Downham Heath 
t 
+ 
t 
Thetford Heath ( Barnham) - 
t 
+ 
Thetford Warren 
t 
+ 
t 
Troston Heath 
t 
Wangford Warren 
t 
+ 
t 
Weather Heath, Icklingham - 
t 
— 
t 
West Stow Heath 
t 
““ 
— 
The molluscan fauna of the heaths and warrens is very 
meagre, the only species met with* being Helicella caper ata, 
Helicella virgata, Vallonia excentrica, Jaminia muscorum. 
Vertigo pygmcea , and Pisidium gassiesianum. H. virgata and 
J. muscorum are abundant near the coast, but are equally 
so on sandy soil in any part of the country. Two species of 
mollusca are. however, Mr. A. Mayfield informs me, par- 
ticularly interesting. The prevailing form of the shell of 
Jaminia muscorum on the Suffolk coast is devoid of denticles 
(var. edentata). At Knettishall most of the specimens have 
two denticles (var. bigranata) and at Brandon they are occasion- 
ally furnished with three teeth, and are of the form known on 
the continent as Jaminia triplicata, Studer. This is a fairly 
common continental form, but has only been found in this one 
locality in England. The other shell worthy of note is a small 
water-snail, Planorbis vorticulus, found as a fossil in the peat of 
the Little Ouse valley among shells, all others of which still exist 
in the neighbourhood. The specimens found at Knettishall 
outnumber those found inallotherEnglishdeposits. In England 
-with one exception-it has only been found in thefossil form,f 
* ‘ Journal of Conchology,’ vol. ii. No. II. 
t It has been found living at Pevensey, Sussex ; in the fossil form in recent 
deposits at Knettishall, Pleistocene at Grays, Essex ; Swanscombe, Kent ; 
and West Withering, Sussex, and in the Cromer Forest Bed at West Runton. 
