History of British animals - University of Guam Marine Laboratory

460 MOLLUSCA. SOLENIDiE. Sanguinolakia.Chama subfusca, List. Conch, t. ccccxx.— S. 1. Linn. Syst.i. 1114. Penn.Brit. Zool. iv. 84. t. xlvi. f. 24. Mont. Test. Brit. 50 Psammobialegumen, Turt. Biv. Brit. 90—South coast of England and Ireland.Length f ths ofan inch, breadth nearly 4 inches ; thin, pellucid, fragile finely;striated by the lines of growth ; hinge nearly in the middle, with one tooth;in one valve, and two in the other, lateral teeth in singleone valve, wingedin the other ; the hinge is strengthened by an oblique internal rib in eachvalve.— - 568. S. cmtiquatus. Transversely oblong, extremities rounded; the dorsal margin slightly convex, the ventral slightly concave.S. cultellus, Penn. Brit. Zool. iv. 85. t. xlvi. £ 25 S. ant. Pult. Dorset.Mont. Test. Brit. 52—Psammobia ant. Turt. Biv. Brit. 91 Englishshores, rare.Length about an inch, breadth two inches ; thin, subpellucid, concentricallystriated by the lines of growth, most conspicuous towards the extremities; hinge in the middle, one tooth in one valve (with sometimes the rudimentsof a second), and two teeth in the other, behind which the marginiscallous.569- S. decllvis.— 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, semitransparent,with a thick dark brown cuticle, irregularly and concentrically striated ;beaks nearly central, sloping gradually to both extremities ; a slight indentationbehind the beaks ; teeth strong, two on each valve, one of them concave ;and in one valve one of them is oblique, behind which the marginis callous.570. S.frag'dis.— Transversely oblong, rounded at the extremities; a little contracted in the middle ; dorsal and ventralmargins nearly parallel.Pult. Dorset. 28. Mont. Test. Brit. 51—Psammobia taeniata, 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 stripefrom the hinge to the ventral margin beaks ; nearly central ; in one valve twoerect teeth, one of which is pointed, the other with one subulate tooth ; a longitudinalrib internally.EXTINCT SPECIES.1. S. affinis Shell linear, subarcuate, rounded at each extremity, hingeplaced near one extremity, surface smooth.dus, Soiver. Min. Conch, t. iii—London Clay.Nearly resembling S. pelluci-Gkn. CXXXVI. SANGUINOLARIA.—Shelltransverselyoblong, dorsal and ventral margins not parallel ; hinge withtwo projecting prominent teeth in each valve.571. S. vespcrtina.— Compressed, concentrically striated ;retralextremity slightly angular.