460 MOLLUSCA. SOLENID.E. Sanguinolaria. 



Chama subfusca, List. Conch, t. ccccxx. — S. 1. Lin7i. 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 fths 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 obUque internal rib in each 

 valve. 



568. S. antiquatus. — Transversely oblong, extremities round- 

 ed ; the dorsal margin slightly convex, the ventral slightly con- 

 cave. 



S. cultellus, Penn. Brit. Zool. iv. 85. t. xlvi. £ 25 — S. ant. Pult. 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. declivis. — Transversely oblong ; exti'emities rounded ; 

 dorsal margin slightly convex ; ventral margin straight. 



Chama angustior. List. Conch, t. ccccxxi. — S. dec. Turt. Conch. Diet. 1G4. 



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 exti-emities ; 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 which the margin is callous. 



570. ^. fragUis. — 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 taeuiata, Turt. 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 nearly 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. o^nis.— Shell linear, subarcuate, rounded at each extremity, hinge 

 ))laced near one extremity, surface smootli. Nearly resembling S. pelluci- 

 dus, Sower. Min. Conch, t. iii. — London Clay. 



Gen. CXXXVI. SANGUINOLARIA.— SheU transversely 

 oblong, dorsal and ventral margins not parallel ; hinge with 

 two projecting prominent teeth in each valve. 



571 . S. vespert'ma. — Compressed, concentrically striated ; re- 

 tral extremity slightly angular. 



