96 CONCHYLIA— l>/r/jriU^. 26. 



Shell three quarters of an inch long, and rather more in 

 breadth, thick, convex, of an angular roundish shape, generally 

 of a dull red color both outside and inside, with usually trans- 

 verse zones of different hues, rarely of an uniform yellow or 

 white : beaks nearly central, with two small blunt teeth in each 

 valve. 



poiygona. Psammobia tesid suhorhiculari, slius transversis longitudi- 

 nalibusqiie minutis, latere antico subangulato, margine 

 subundato. 

 Shell somewhat orbicular, with transverse and minute longitudi- 

 nal striae, somewhat angular at the anterior side, and undulate 

 at the margin. 

 Tellina polygona. Montagu, Suppl. p. 27, tab. 28, fig. 4. 

 Pennant, Brit. Zool. iv. p. 185. 

 JFoorf, Conch, p. 190. 

 Ttirton, Conch. Diet. p. 180. 

 Tellina Guinaica. Dillwyn, Descript. Catal. p. 96. 



Chemnitz, x. p. 348, tab. 170, fig. 1651-53. 

 Found by Captain Laskey, in the Firth of Forth. 



Shell half an inch long, and rather more in breadth, dirty white, 

 somewhat truncate and angular at one end and rounded at the 

 other, with fine transverse stria? and minute longitudinal ones: 

 the margin uneven: beaks not quite central; in one valve two 

 large distant teeth, in the other a large cloven triangular tooth 

 and a small one near it. 



