142 MACTRA. 



piperata. 26. Shell sub-triangular, roundish, com- 

 pressed, and finely striated transversely; 

 hinge without lateral teeth. 



Mactra piperata. Poiret. Voyage en Barbarie, ii. p. J 5. 



Gmelin, p. 3261. 

 Mactra compressa. Solander's MSS. Pulteneys Dorset 



Cat. p. 31. Montagu Test. p. 96. 

 Mactra Listeri. Gmelin, p. 3261. Maton and Racket, 



in Lin. Trans, viii. p. 71. Dorset Cat. p. S3, t. 7. f. 1. 

 Mactra, No. 18. Schroeter Einl. iii. p. S7. 

 Venus dealbata. Gmelin, p. 3295. 

 Venus gibbula. Gmelin, p. 3289- ? 

 Venus borealis. Pennant Brit. Zool. iv. p. 96. 

 Mya gaditana. Gmelin, p. 3221. 

 Mya Hispanica. Chemnitz, vi. p. 31. t. 3. f. 21. 

 Tellina plana. Donovan, ii. t.64. f. 1. 

 Trigonella plana. Da Costa Brit. Conch, p. 200. t. 13. 



f. 1. 

 Bonanni Rec. 3. f. 52. and Kirch, f. 51. Lister. Anim. 



Ang. t. 4. f. 23. and Conch, t. 253. f. 88. Petiver Gaz. 



t. 94. f. 3. Adansun Senegal, t. 17. f. 18. £wc. Meth. 



t.257. f-4. 

 Inhabits the sea, generally about the mouths of rivers. Mouths 

 of the Niger. Adanson. Mediterranean. Poiret. Coasts 

 of Britain. Lister, fyc. Spain. Chemnitz. 

 Shell about an inch and a quarter long, an inch and a half 

 broad, and rather more than half an inch high ; thin, semi- 

 pellucid, of a reddish or yellowish white colour, and some- 

 times stained with black by the mud, which it generally in- 

 habits; the umbo is small and central, and the hinge without 

 any lateral teeth. Bonanni Rec. 2. f. 55., from which V. 

 gibbula of Gmelin has been constituted, is referred to in Da 

 Costa's British Conchology as a variety of this species. 



tenuis. 27. Shell sub-triangular, rounded, compres- 

 sed, and transversely wrinkled ; hinge with 

 lateral teeth in only one valve. 



Mactra tenuis. Montagu Test. p. 572. t. 17. f. 7. Ma- 

 ton and Racket in Lin. Trans, viii. p. 72. Dorset Cat. 

 p. 33. 

 Inhabits the shores of Britain. Moritagu, §c. 

 Shell generally about a quarter of an inch long, and the breadth 

 somewhat exceeds the length, but is sometimes considerably- 

 larger ; it may be distinguished from M. piperata, by its hav- 



