CO^CHYLIX—DITHYRA. 15 



LiSTERA. 



Tab. nost. 5, fig. I and 2. 

 Mactra Listeri. Gmelin, Syst. p. 3261. 



Turton, Linn. Syst. iv. p. 213. 



Pennant, Brit. Zool. p. 194. 



Linn. Trans, viii. p. Tl. 



Dorset Catal. p. 33, tab. 7, fig. 1. 



Turton, Conch. Diet. p. 83. 

 Mactra compressa. Montagu, Test. Brit. p. 9S, 



Turton, British Fauna, p. \S5. 

 Tellina plana. Donovan, Brit. Shells, ii, tab. 64, fig. 1. 

 Mactra piperita. Dillwyn, Descript. Catal. p. 142. 

 Mya Hispanica. Chemnitx, vi. p. 31, tab. 3, fig. 21. 

 Trigonella plana. Da Costa, p. 200, tab. 13, fig. 1 

 Pectunculus latus. Lister, Conch, tab. 253, fig. 88. 

 Mus. nost. The mouths of rivers and muddy shores. 



^1 



compifssa 

 1 



Shell an inch and a half long, and nearly two inches broad, 

 thin, flat, semitransparent, whitish with sometimes transverse 

 colored bands, of a somewhat oval triangular figure and rounded 

 at both ends : beaks small, nearly central : hinge with a single 

 additional denticle in one valve closing between two in the other. 



We believe that the Mactra deaibataof Montagu, p. 95, tab. 5, 

 fig. 1, and the M. pellueida of Chemnitz, vi. tab. 24, fig. 234, is 

 this species : one of the sides being occasionally a little more 

 elongated, as is represented in our plate. 



■ 2 



•-:■■) 



