LAND AND FRESHWATER MOLLUSCA OF SUSSEX. 165 
about Lewes.—U. Abundant in the neighbourhood of Harting.— 
W. Common also in the vicinity of Brighton.—M. 
Valvata cristata. The Crested Valve-shell.—In weedy ditches 
at Eastbourne, and in a pond at Old Dean Farm, Henfield, on the 
dead stalks of the weeds.—B. 
Order PULMONOBRANCHIATA.* 
Fam. LIMN#IDR. 
Planorbis corneus. The Horny Coil-shell.— Abundant in 
stagnant ditches in the levels of the Arun, Adur, Ouze, and Cuck- 
mere rivers.—B. In the ditches at Malling, and very fine in 
ditches on Pevensey level.—U. Mr. W. Jeffery remarked it in 
great numbers in the mud thrown out of a “rithe” some years ago 
at Bersted. 
Planorbis albus. The White Coil-shell.—Common in ponds 
on the clay, but not found in those of the sand or chalk.—B. 
Mr. W. Jeffery has found it in the stream at Ratham. 
Planorbis glaber. The Smooth Coil-shell.—<I have only 
found this species in a small pond in my own grounds at Cow- 
fold.” —B. | 
Planorbis nautileus. The Nautilus Coil-shell—At Ratham 
and Wisboro’ Green.—J. Under the synonym imbricatus, 
Mr. Unwin includes this species in his list of Mollusca in the 
vicinity of Lewes. He describes it as “rare on Callitriche 
verna in a ditch near the Ouse.” It is included, under the 
same name, in the Brighton list without any comment. Mr. 
Borrer names it Planorbis cristatus, and notes it as occurring 
in a shallow pond at Cowfold, and in some of the ditches in the 
level of the Adur at Henfield. 
Planorbis carinatus. The Keeled Coil-shell—Common in the 
levels of the Arun and the Adur, in weedy ditches and occasionally 
in ponds. 
Planorbis complanatus, vel marginatus. The Flattened Coil- 
shell.—Found in similar situations to the last-named, and much 
commoner. Occurs in all the ponds and water-courses about 
Harting.—W. 
Planorbis vortex. The Whorled Coil-shell.— Common in stag- 
nant weedy ponds. 
* Having lung-like gills. 
