CONCHYLIA— i>ir//l/?4. 43. 195 



alternately closing together : lateral teeth none. Ligament 

 marginal, external. 



All the species of the Mussel, properly so called, are confined 

 to the above generic character, and as far as we know them, are 

 furnished with small obtuse teeth under the points of the beaks ; 

 a circumstance sufficient to distinguish them from the Modiola, 

 which is always destitute of them. 



Mytilus testd semiovatd transversim rugosu, antice curvatd, >iDguiatus. 



umbonibus subquadridentatis. 

 Shell semioval witli transverse plaits, curved on the anterior side, 



with i'our or tive teeth in the hinge. 

 Mytilus ungulatus. JLiiin. Syst. Nat. p. 1157. 



(Jmelin, Syst. p. 3364. 



Turton, Linn. Syst. iv. p. 592. 



Chemnitz, viii. p. 176, tab. 85, fig. 756. 

 Dunovan, British Shells, iv. tab. 128, tig. 2. 



Linn. Trans, viii. p. 107. 



Pennant, Brit. Zool. iv. p. 238. 



Diilwyn, Descript. Catal. p. 310. 



Turton, Conch. Diet. p. 111. 

 Mytilus ungulinus. .Mnntagu, Test. Brit. p. 582. 



Turtvn, British Fauna, p. 164. 

 Musculus major. Lister, Conch, tab. 360, fig. 199. 

 Mus.nost. From Cornwall, but probably French. 



Shell four or five inches long, and nearly two broad, covered 

 with a [lurplish or blackish skin, and resembles the common 



2c 2 



