COncnYLiA—DITHYRA. 43. I97 



Mytilus testa ovatd crassa opacd tumidd, anticS incurvatd umbonibus incurvatus. 



3. 

 divaricatis subbidentatis. 



Shell oval thick opake and tumid, incurved on the anterior side, the 



beaks divaricate with two or three teeth. 



Mytilus incurvatus. Pennant, iv. p. 287, tab. 67, fig. 1. 



Montagu, Test. Brit. p. 160. 



Linn. Trans, viii. p. 106, tab. 3, fig. 7. 



Turton, Linn. Syst. iv. p. 192. 



Turton, British Fauna, p. 163. 



Turton, Conch. Diet. p. 109. 

 Mytilus edulis. Var. Dillwyn, Descript. Catal. p. 309. 

 Musculus parvus. Lister, Conch, tab. 362, fig. 201, 202. 

 Mus. nost. Western coasts and Ireland. 



Shell hardly an inch and a half long, strong, tumid, much curved, 

 of a blueish-grey color, with the beaks separated, and two or three 

 teeth only under them. 



Mytilus testa ovatd diaphand cosruled radiatd, antice rectd, um- pellucidus. 



bonibus conniventibus subbidentatis. 

 Shell oval transparent blue and radiate, straight on the anterior side, 

 the beaks close together with two or three teeth. 

 Tab. nost. 15, fig. 1 and 2. 

 Pennant, iv. p. 237, tab. 66, fig. 3. 

 Turton, Linn. Syst. iv. p. 292. 

 Montagu, Test. Brit. p. 160. 

 Donovan, British Shells, iii. tab. 81. 

 Linn. Trans, viii. p. 107. 

 Turton, British Fauna, p. 163. 



