Pvn H,i I'UitlS

.'386 tellinid^e.
G. Shell oblong, inequilateral, angulated, and slightly gaping
at the posterior end, concentrically striated ;
more developed.
lateral teeth
7. T. doxa'cina *, Linne.
T. donacina, Linn. Syst. Nat. p. 1118 ; F. & H. i. p. 292, pi. xx. f. 3, 4,
and (animal) pi. K. f. 4.
Body oblong, compressed, white : mantle not fringed, bnt
finely dentated (Clark) (" conspicuously fringed,"
Forbes and
Hanley) : tabes long and slender, with plain orifices, marked
at their sides by whitish lines, which appear to represent rows
of cilia :
gills suboval, nearly of the same size, pale brown,
smooth outside, and striated inside by about 30 delicate vessels
of the branchial circulation: palps subtriangular, narrow, lon-
gitudinally furrowed, but otherwise smooth outside and pectinated
within :
foot pure white, flat, broad, long and pointed.
Shell triangularly oblong, compressed, of a moderate thick-
sculpture, numerous fine
ness, opaque, more or less glossy :
concentric and rib-like striae, which are more close-set in
the young, and consequently cover the umbonal area in the
adult, besides intermediate and more delicate striae, only observable
by means of a high magnifier, and then chiefly in the
interstices of the larger striae : colour yellowish-white, rarely
saffron, ornamented with bright pink longitudinal rays and a
more conspicuous but shorter streak of a deep rosy or carna-
tion hue just below the beak in each valve on the ligamental
side ; the rays are generally broken or interrupted, and fre-
quently confluent, and they vary in number and arrangement,
being often in pairs ; in some specimens the ground-colour is
rosv and the rays white : epidermis fibrous, light reddishbrown,
seldom retained except in the young : margins rounded
in front, with an oblique and somewhat flexuous curve to the
posterior end, also rounded and wedge-shaped on the anterior
side, truncate and flexuous on the posterior side, which ends
in a blunt angle ; dorsal margins on both sides straight, the
anterior twice as long as the posterior, forming between them
at the point of junction a well-defined obtuse angle ; the posterior
side slightly gapes, and has an obscure ridge in each
valve, extending from the beak to the point of the lower angle :
beaks small, sharp, and contiguous, turned towards the pos-
terior side : ligament large, prominent, dark horncolour, sepa-
* So named from its resemblance to a Donax.