THE MOLLUSCA OF KENT, SURREY AND MIDDLESEX. 179 
Acteon tornatilis.—One at Margate (S. C. C.). 
[Scaphander lignarius.— One shell at Hastings (E. L.).] 
Philine aperta.— Shellness (S. C.C.). P. catena, Margate, rare. 
Pleurobranchus membranaceus.—Pegwell Bay (Science Gossip, 
1870, p. 64). 
Of the Nudibranchs I have found a small light-coloured Doris 
in a rock-pool at Dover, and two specimens of Holis have been 
taken at Margate. I do not know this section sufficiently well to 
be able to identify them with certainty. [Hastings Nudibranchs, 
Doris bilineata (bilamellata?), EHolis papillosa, E. pellucida ?, 
Idalia aspersa? (Science Gossip, Sept. 1869). ] 
E\stuARINE GASTROPODA. 
Hydrobia ventrosa.—Greenwich Marshes, with L. peregra and 
Planorbis spirorbis. East Kent, Richborough (S.C.C.). [Hastings 
(E. L.).] Var. elongata, Erith Marshes, with H. ulve (Leslie). 
H. similis.— Woolwich. 
H. ulve.—St. Nicholas Marsh and Pegwell Bay, abundant. 
Hydrobia marginata is found fossil at Crayford and Erith 
(R. W. Cheadle and B. B. Woodward), and still survives in France. 
Assiminea grayana.—Sandwich (D. B.C. & S.C. C.). Nagden 
(M. A. Oldroyd). Near Greenwich. 
Melampus myosotis—Richborough, in rejectamenta of River 
Stour; type abundant, var. ringens one only. Type at Erith 
(Leslie). 
M. bidentatus.—Richborough, one in rejectamenta of River 
Stour (S. C. C.). 
Otina otis.—Sandwich and Reculvers (Brit. Conch.). 
FLUVIATILE GASTROPODA. 
Neritina fluviatilis——Abundant in the Thames at Hammer- 
smith. Weybridge (M‘Kean). Dead shells are sometimes thrown 
up by the sea at Margate, but their derivation is doubtful. [This 
species is also reported from both divisions of Sussex, and 
from Bucks. | 
N. consobrina, N. globosa, and N. elegans are found in the 
fossil state. 
Ampullaria occurs fossil in Surrey (KE. H. Rowe). 
Paludina contecta.—Middlesex, West Drayton (R. W. Cheadle). 
Flanchford, near Reigate (E. Saunders); it does not appear to live 
