Pvn H,i I'UitlS

FSAMMOBIA. 391
punicea of Ginelin (T. lata, Pulteney, and T. incequi-
striata, Donovan) may belong
to the southern fauna of
Great Britain, as it inhabits the Mediterranean ; but I
do not think it ought to be admitted without further
evidence. Pultenev is believed to have found it on the
coast of Dorsetshire Brown is ;
reported to have dredged
a specimen off Holy Island, and "
gives Leith
"
shore
on the authoritv of Sir Patrick Walker ; and Mr.
Spencer brought me a couple of valves from Heron. T.
elliptica and T. pellucida of Brown are irrecognizable •
the former is possibly the young of Tapes pullastra, and
the latter the frv of Lucina borealis.
Genus III. PSAMMO'BIA * Lamarck. PL VII. f. 4.
Bodt oblong or elongated, compressed : tubes longitudinally
lineated or marked with rows of cilia ;
orifice of each tube, or
only of the incurrent or alimentary one, furnished with dentate
points.
Shell oblong or elliptical, equivalve, nearly equilateral,
compressed, striated concentrically as well as longitudinally ;
: teeth, two car-
posterior side somewhat truncate and gaping
dinals in each valve, the posterior one in the left valve being
disproportionately small and set obliquely, the others cloven ;
no laterals.
Tellina and this genus are near neighbours ; but in
Psammobia the tubes are furnished externallv with Ion-
gitudinal rows of cilia, the shell is more or less equalsided
and sculptured by longitudinal as well as con-
centric strire, and the posterior extremity has a decided
gape.
Two other generic names (Lux, Chemnitz, and Gari,
Schumacher) have precedence of that given by Lamarck,
but they are antiquated.
* Living in sand.