42 CONCHYLI A— D/THYE^. 13. 



13. VA^OVMA— LAMARCK. 



Testa transversa, cequivalvis, lateribus ineequaliter hiantibus. Cardo 

 dente unico conico in utrdque valvd et hinc callum breve ascendens 

 non exsertum : lateralibus nullis. Ligaraentum externum, callis 

 affixum. 



Shell transverse, equivalve, unequally open at the sides. Hinge 

 with a single conic tooth in each valve, and a short ascending 

 callosity on one side which is not exserted: lateral teeth none. 

 Ligament external, fixed to the callosities. 



Glycymeris. PanoP^EA. 



Mya Glycymeris. Gmelin, Syst. p. 3222. 



Turton, Linn. Syst. iv. p. 178. 



Chemnitz, vi. p. 33, tab. 3, fig. 25. 



Pennant, Brit. Zool. iv. p. 160. 



Donovan, Brit. Shells, iv. tab. 143. 



Montagu, Test. Brit. Suppl. p. 19. 



Linn. Trans, viii. p. 34. 



Turton, Brit. Fauna, p. 146. 



Wood, Conch, p. 114, tab. 25, fig. 1. 



Dillwyn, Descript. Catal. p. 41. 



Turton, Conch. Diet. p. 107. 

 Chama Glycymeris. Lister, Conch. Diet. tab. 414, fig. 258. 



Admitted among the British shells, by Donovan, in consequence 

 of its having been taken once on the Dogger bank. And after a 

 severe gale, we once found, on the beach at Teignmouth. the frag- 

 ment of a large valve, which from its tooth and ligament appeared 

 to belong to this genus. 



