CONCHYLIA— D/rffFi?^. 44. 201 



MoDiOLA testa ovatd ventricosd, anticS subacuminatd, umbonibus ter- dJscors. 



3. 



minalibus subconvolutis, extremitatibus longitudinaliter costulatis. 

 Shell oval very tumid, rather pointed at the anterior side, beaks ter- 

 minal ond somewhat convolute, and slightly ribbed longitudinally 

 at both ends. 



Tab. nost. 15, fig. 4. 

 Mytilus Discors. Linn Syst. Nat. p. 1 159. 

 Gmelin, Syst p. 3356. 

 Turton, Linn. Syst. iv. p. 294. 

 Chemnitz, viii. p. 191, tab. 86, fig. 764, 765. 

 Da Costa, p. 221, tab. 17, fig. 1. 

 Montagu, Test. Brit. p. 167. 

 Pennant, Brit. Zool. iv. p. 240. 

 Linn. Trans, viii. p. Ill, tab. 3, fig. 8, 

 Turton, British Fauna, p. 164. 

 Dorset Catal. p. 40, tab. 2. fig. 1. 

 Dillwyn, Descript. Catal. p. 319. 

 Turton, Conch. Diet. p. 112. 

 Walker, Test, minut. p. 22, fig. 79. 

 Mus. nost. Western coasts and Ireland. 



Shell hardly an inch long, greenish or brownish horn-color, often 

 spotted, semitransparent, a little constricted at the margin towards 

 the pointed end, and divided into three compartments ; the extrem- 

 ity at the beaks marked with about sixteen longitudinal ribs, and 

 the opposite or pointed extremity with numerous similar ribs, with 

 the middle part between these ribs slightly striate transversely: 

 beaks quite terminal, very obtuse, and twisted into a single flat 

 yolution. 



