CO^GRYLIA—DITHYRA. 15. 51 



LiSTERA compressa 



Tab. nost. 5, fig. 1 and 2. 

 Mactia Listeri. Gmelin. Syst. p. 3261. 



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



Pennant, Brit. Zool. iv. p. 194. 



Linn. Trans, viii. p. 71. 



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



Turton, Conch. Diet p. 83. 

 Mactra compressa. Montagu, Test. Brit. p. 96. 



Turton, British Fauna, p. 155. 

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



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

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

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

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

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



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 dealbata of Montagu, p. 95, tab. 5, 

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

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

 gated, as is represented in our plate. 



h2 



