102 
Rackett, p. 49; Tellina Ferréensis, Maton and Rackett, p. 49; 
Tellina fervensis, Montagu, p. 55; Tellina trifasciata, Donovan, 
II, pl. 60. 
Shell transversely oblong-ovate, somewhat subquadrangular ; 
obliquely subtruncated at the anterior side; from the base of 
the truncation to the umbones runs an oblique, elevated ridge, 
where it forms an angle, and renders all the striw above it 
angulated, and more rugose than on other parts of the shell; 
and with longitudinally oblique stria; compressed, finely stri- 
ated transversely; umbones obtuse, nearly central; surface 
elegantly radiated in sets of from three to six, with deep crim- 
son and white alternating, and these are frequently crossed by 
two or three fillets of crimson; two cardinal teeth in each valve, 
but destitute of lateral ones; inside bluish-white, or pale lilac, 
sometimes of a delicate rosy hue; margin plain. When perfect, 
the external surface is covered with a very thin yellowish-brown 
epidermis. 
This handsome species inhabits many of the sandy shores of 
Britain and Ireland, and especially prevails on both sides of the 
Trish Channel. 
2. PSAMMOBIA VESPERTINA, pl. XL, f. 3. 
Psammobia vespertina, First Ed., pl. 16, f. 3; Turton, Biv., 
p- 92, pl. 6, f. 10, young; Solen vespertinus, Maton and Rackett, 
p- 47; Tellina variabiles, Donovan, II, pl. 41, f. 2; Tellina 
depressa, Pennant, IV, p. 87, pl. 47, f. 27; Sanguinolaria ves- 
pertina, Fleming, p. 460; Gobreus vespertinus, Leach, MSS., 
p. 6. 
Shell transversely oblong-ovate, rounded at both sides, mode- 
rately thick, and subcompressed; umbones rather small, and 
situate nearly central; surface white, or pale flesh-coloured, 
covered with very fine, concentric strie; with numerous radia- 
tions of red, or purplish-red, disposed in single, double, or 
numerous rays, from the umbones to the base; two teeth in 
one valve, and one in the other, with a strong projecting lamina 
in both valves; inside smooth, glossy, and for the most part 
purple of different degrees of intensity in various individuals, 
but generally of a deeper hue in young shells; some are pale 
pink, bluish-white, or orange; sometimes with two rays below 
the umbo; margin plain, beautifully streaked with the prevail- 
ing colour in some specimens. Length an inch and five- 
eighths ; and two inches and a half in breadth. 
A small variety of this species is found at Loch Ryan, Scot- 
land, with the sides more rounded; first noticed by William 
Nicol, Esq. 
Found at Falmouth, Cornwall; Kingsbridge, Devonshire ; 
Poole and Weymouth, Dorsetshire; the Irish Channel, of a 
large size; in several situations on the Eastern coast of Ireland; 
and the Frith of Forth, Scotland. 
3. PSAMMOBIA TELLINELLA, pl. XXXIX, f. 30, 31. 
Psammobia tellinella, Forbes, p- 55; Psammobia florida, 
Turton, Biv., p. 86, pl. 6, £.9; Fleming, p- 437. : 
Shell transversely oblong-ovate, equally rounded at both 
sides, a little convex; umbones placed nearly central, and but 
slightly produced; colour pale bluish-violet, with longitudinal 
rays of reddish-purple, or brownish-purple, crossed by reddish 
zones of the same colour, or alternating with straw-yellow ; 
hinge with a single cleft tooth in one valve, and a cavity on 
each side for the reception of the two teeth of the opposite 
valve; inside pale yellow, or rich reddish-purple; margins quite 
MOLLUSCA. 
[Concuacka. 
plain, and rather sharp at the edges. 
breadth one inch. 
Length half an inch; 
This species is much more inflated than P. vespertinus, when 
of this size, and more angular at the sides; and differs materially 
in the teeth. 
Found on the Western coast, and Portmarnock, Ireland. 
4, Psammosia poLycGona, pl. XXXIX, f. 33. 
Psammobia polygona, Turton, Biv., p. 96; Fleming, p. 439, 
Tellina polygona, Montagu, Sup., p. 27, pl. 28, f. 4. 
Shell subovate, suborbicular, subcompressed; umbones ferru- 
ginous, small, subcentral, and inclining to neither side; shorter 
side somewhat truncated, and slightly angulated; larger side 
well rounded; colour cream-white, with very fine concentric 
strize, which are decussated by excessively fine longitudinal striae, 
and are invisible without the aid of a strong lens; inside dull 
white; margin uneven; two large, distant teeth in one valve, 
and one very large, bifid, triangular tooth in the other, with a 
very small approximate one. Length half an inch; breadth 
somewhat more. 
Dredged off Cramond Island, Frith of Forth, by Captain 
Laskey. 
5. PsamMMosia cosTuLaTa, pl. XXXIX, f. 34. 
Psammobia costulata, Turton, Biy., p. 87, pl. 6, f.83 Fle- 
ming, p- 437. 
Shell transversely oblong-ovate, thin; slightly angular at the 
anterior end, which is provided with about twelve fine, obliquely 
longitudinal ribs, radiating from the umbones, which are nearly 
central, slightly produced, and* not inclining to either side; 
colour varying from pale yellow to deep purple, and marked 
with crimson blotches and stripes; whole surface covered with 
extremely fine, longitudinal, and transverse strie ; inside of the 
same hue as the exterior, and generally more vivid; in one 
valve a slightly cleft tooth, which locks between two cardinal 
teeth in the opposite valve, one of which is slightly bifid. 
Four specimens of this beautiful shell were taken by the 
dredge in the Channel and in Torbay, by Dr. Turton; three 
of them alive. 
6. Psammosia Jucosa, pl. XL, f. 4, 5, 6. 
Psammobia jugosa, Virst Ed., pl. 16, f. 4, 5, 6; Psammobia 
fragilis, Turton, Biv., p. 88; Fleming, p. 438; Tellina jugosa, 
Brown, Wernerian Mem., II, p. 506, pl. 24, f. 2. 
Shell transversely oblong-ovate, moderately strong, rather 
inflated; of a brownish-yellow colour; anterior side acuminated, 
and provided with an elevated, rapidly enlarging ridge, emana- 
ting at the umbo, and terminating on the side; posterior side 
much rounded; umbones placed towards the posterior side, 
rather large, elevated, and slightly turned to one side; whole 
surface covered with numerous, very sharp, elevated, concentric, 
somewhat waved, laminar striz, the interstices thickly covered 
with decussated, extremely minute, longitudinal and transverse 
undulating strie; hinge with two primary teeth, and a lateral 
one in each valve; in the left valve a large, broad, bifid, re- 
flected, elevated tooth, which bends outwards, pointing to the 
umbo, two-thirds of which is elevated above the margin of the 
shell; the other tooth is thin, and small, running obliquely 
alongside the lateral tooth, which rises near the umbo, and 
obliques towards the anterior side, and is most elevated at its 
termination; over this tooth is placed the ligament; in the right 
valve the teeth are similar to those of the opposite valve, the 

