° 
DAVY: LINCOLNSHIRE NATURALISTS AT GIBRALTAR POINT. 47. 
and varied flora. In few places is the ‘Salt Marsh’ 20 feet above 
Ordnance Datum level, most of it is from to to 15 feet and in some 
cases it is only 7 to 8 feet. As the highest spring tides sometimes 
rise to 16 feet, the whole marsh would then be flooded if not 
protected by a sea-bank. Mr. A. J. Jukes-Browne, B.A., F.G.S., in 
his ‘Memoirs of the Geological Survey of England and Wales 
(Explanation of Sheet 84)’ describes this sea-bank on p. 111, as 
follows : ‘ The whole coast-line of East Lincolnshire, from Gibraltar 
Point south-east of Wainfleet to Donna Nook north of Saltfleet, 
them being blown off the foreshore outside. This strip of Blown 
Sand is widest near the southern and northern edges of the map 
[Sheet 84, Geol. Survey], being about a quarter of a mile (440 yards) 
wide at these points, it is also about the same width near Saltfleetby, 
but elsewhere it is very narrow, and in some places not more than 50 
or 60 yards broad. The sand is piled up into mounds and 
hummocks, and is held together by a growth of “Mat grass,” or 
‘““Marram” (Arundo arenaria), with which Hordeum maritimum 
(coast barley) and Zriticum junceum (wild wheat) are frequently 
associated ; the Sea Buckthorn (Hippophde rhamnoides) and the Blue 
Bramble (Rudus cesius) are also abundant, and their roots assist in 
holding the sand together. In height the sand-hills vary from 20 to 
40 feet above the level of the land inside, which they protect from 
the inroads of the sea.’ 
Mr. Mason has kindly supplied the following list of Vertebrata 
noted during the day, with some of their local names. All except 
those marked with a star (*) were seen by himself. 
MAMMALIA. 
Arvicola amphibia L. Water Vole. A young one was 
taken, and after careful scrutiny, and being carried in a box 
some hours, was finally released. 
BIRDS. 
Turdus musicus L. Song Thrush. ‘Thrush.’ 
Turdus merula L. Blackbird. 
Ruticilla phenicurus L. Redstart. 
Motacilla lugubris L. Pied Wagtail. ‘Dishwasher.’ 
Anthus pratensis L. Meadow Pipit. ‘Ground Lark.’ 
irundo rustica L. Swallow. 
Chelidon urbica L. Martin. 
Cotile riparia L. Sand Martin. 
F eb. 186: 1892. 
