460 MOLLUSCA. SOLENIDiE. Sanguinolaiua. 
Cliama subfusca, List. Conch, t. ccccxx.— S. 1. Linn. Syst. i. 1114. Penn. 
Brit. Zool. iv. 84. t. xlvi. f. 24. Mont. Test. Brit. 50. — Psammobia 
legumen, Turt. Biv. Brit. 90 — South coast of England and Ireland. 
Length f ths of an inch, breadth nearly 4 inches ; thin, pellucid, fragile ; fine- 
ly striated by the lines of growth ; hinge nearly in the middle, with one tooth 
in one valve, and two in the other, lateral teeth single in one valve, winged 
in the other ; the hinge is strengthened by an oblique internal rib in each 
valve. 
568. S. antiquatus. — Transversely oblong, extremities round- 
ed .* the dorsal margin slightly convex, the ventral slightly con- 
cave. 
S. CLiltellus, Penn. Brit. Zool. iv. 85. t. xlvi. f 25. — S. ant. PulL Dorset. 
Mont. Test. Brit. 52. — Psammobia ant. Turt. Biv. Brit. 91 English 
shores, rare. 
Length about an inch, breadth two inches ; thin, subpellucid, concentri- 
cally striated by the lines of growth, most conspicuous towards the extremi- 
ties ; hinge in the middle, one tooth in one valve (with sometimes the rudi- 
ments of a second), and two teeth in the other, behind which the margin is 
callous. 
569- S. declwis. — Transversely oblong ; extremities rounded ; 
dorsal margin slightly convex ; ventral margin straight. 
Chama angustior. List. Conch, t. ccccxxi — S. dec. Turt. Conch. Diet. 164. 
t. xxii. f. 80.— Scilly Islands. 
Length three quarters of an inch, breadth two inches ; thin, semitranspa- 
rent, with a thick dark brown cuticle, irregularly and concentrically striated ; 
beaks nearly central, sloping gradually to both extremities ; a slight indenta- 
tion behind the beaks ; teeth strong, two on each valve, one of them concave ; 
and in one valve one of them is oblique, behind Mfrich the margin is callous. 
570. fragilis. — Transversely oblong, rounded at the ex- 
tremities ; a little contracted in the middle ; dorsal and ventral 
margins nearly parallel. 
Pult. Dorset. 28. Mont. Test. Brit. 51— Psammobia taeniata, Ttirt. Biv. 
85 — English and Irish coasts, rare. 
Length half an inch, breadth nearly an inch ; thin, transparent, smooth, 
with a greenish cuticle, sometimes marked with a longitudinal reddish stripe 
from the hinge to the ventral margin ; beaks nearl}’^ central ; in one valve two 
erect teeth, one of which is pointed, the other with one subulate tooth ; a lon- 
gitudinal rib internally. 
EXTINCT SPECIES. 
1. S. Shell linear, subarcuate, rounded at each extremity, hinge 
placed near one extremity, surface smooth. Nearly resembling S. pelluci- 
dus, Sower. Min. Conch, t. iii . — London Clay. 
Gen. CXXXVI. SANGUINOL ARIA.— .Shell transversely 
oblong, dorsal and ventral margins not parallel ; hinge with 
two projecting prominent teeth in each valve. 
571. S. vespertina. — Compressed, concentrically striated ; re- 
tral extremity slightly angular. 
