78 MOLLUSCA OF SOMERSET. 
SCAPHANDRID-. 
SCAPHANDER LIGNARIUS, Linné. 
W eston-super-Mare ! 
BULLINELLA CYLINDRACEA, Pennant (=Cylichna cylin- 
dracea, Pennant). 
This species frequent in muddy sands on all our coasts is 
the Cylindrella alba of Swainson. 
W eston-super-Mare ! 
PHILINIDA. 
PHILINE APERTA, Linné. 
This well-known British species is said by Gwyn Jettreys 
to attain its largest dimensions in the Bristol Channel. 
AURICULIDZ2. 
LEUCONIA BIDENTATA, Montagu (=Melampus bidentatus, 
Montagu). 
This species, the Conovulus bidentatus of Forbes and Hanley 
(1Vv, p. 191), is not uncommon at the mouth of the Avon. 
** Banks of the Avon near Pill”; Cundall. 
Var, alba, Turton. 
Banks of the Avon near Pill; Cundall. 
ALEXIA DENTICULATA, Montagu (=Melampus denticulatus, 
Montagu). / 
It is the Melampus myosotis, Draparnaud, var. ringens, 
Turton, which has been juggled into the above name! Forbes 
and Hanley record that ‘it is found in many localities, especi- 
ally on the southern and western coasts of England,” and 
mention the Avon, near Bristol. 
‘** Banks of the Avon near Pill” ; Cundall. 
Var. myosotis Draparnaud (=Melampus myosotis, Dra- 
parnaud ). 
*“ Banks of the Avon near Pill”; Cundall. 
1. ‘The brackish-water members of this family are included by the Conch- 
ological Society in both their published lists of British Mollusca (marine and 
non-marine), but under different generic names! See Awriculide in the non- 
marine section of this paper, and note the absurd juggling of names! It is 
unfortunately a matter of common knowledge that these farcical re-christenings 
are taking place constantly in all departments of natural science. 
