242 CO^CnXLlA-niTHYRA. 54. 



54. VmO—BRUGUIERE. 



Testa transversa, eequivalvis, incequilateralis, laterilms suh- 

 hiantibus ; umbonibus eroso-decorticatis. Cardo dente vo- 

 nico obtusu laciniato, valra; alterins biloho ; et sinu margi- 

 tiali antico remoto : lateralibtis nullis. Ligamenlum exlermim. 



Shell transverse, equivalve, inequilateral, a little open at tlie 

 sides ; with the beaks decorticated and eroded. Hinge with 

 an obtuse conic jagged tooth, which in one valve is divided into 

 two lobes; and a remote cardinal depression on the anterior 

 side : lateral teeth none. Ligament external. 



A genus distinguished from the Anodon, by the conic obtuse 

 rugged teeth, and from the Mysca and Cyclas by the want of 

 lateral teeth ; and by the cavity on the cardinal margin at the 

 anterior termination of the ligament. 



Inhabitants of clear rapid rivers, where they lie imbedded in 

 the gravel, with the anterior end just above the surface, and are 

 often rooted up and cast on shore by floods and torrents, The 

 valves are used as spoons by the Irish peasantry. 



maigavitife- Unio testii oblongu subarcnatu, latere antico angulato. 

 "{*■ Shell oblong and slightly curved, angular at the anterior side. 



Tab. nosl. 16, fig. 1. 

 Mya margaritifera. Lmn. Syst. Nat. p. 1112. 

 G/Me/j«, Syst. p. 3219. 

 Tnrton, Linn. Syst. iv. p. 176. 

 Pennant, iv. p. 163, tab. 46, fig. 2. 

 Chemnitz, vi. p. 15, tab. 1, fig. 5. 



