146 MACTRA. 



Mactra planata. Chemnitz, vi. p. 238. t. 24. f. 238 and 



239. 



Mactra complanata. Gmelin, p. 3261. 



Mactra oblongata. Solander's MSS. 



Mactra Lutraria Var. Maton and Racket, in Lin. Trans. 

 viii. p. 73. 



Mactra, No. 15. Schroeter Einl. iii. p. 86. 



Erie. Method, t. 258. f. 4. 

 Inhabits the coast of Tranquebar, and the Nicobar Islands. 



Chemnitz. Has been found near Weymouth. Solander. 

 Shell about an inch and a quarter long, two inches and a quarter 



broad, and three quarters of an inch high, and may be readily 



distinguished from ill*, lutraria by the margin on the sides of 



the hinge, which forms nearly a straight line. 



lutraria. 37. Shell oval-oblong, gaping, some- 

 what pellucid, irregularly striated transverse- 

 ly, and the hinge without lateral teeth. 



Mactra lutraria. Linnccus Syst. Nat. -p. 1126. Pennant 

 Zool. iv. p. 92. t. 52. f. 44. Chemnitz, vi. p. 239- t. 24. 

 f. 240 and 241. Schroeter Einl. iii. p. 79. Gmelin, p. 

 3259. Donovan, ii. t. 58. Montagu Test. p. 100. Dor- 

 set Cat. p. 33. t. 5. f. 11. Brooks's Introd. p. 62. t. 2. 

 f. 20. 

 Baphia Mirio. Meuschen Mus. Gevers. p. 472. No. 1839. 

 Lutraria elliptica. Lamarck Syst. des Anim. p. 120. 

 Lister Anim. Ang. t. 4. f. 19. and Conch, t. 415. f. 259. 

 Eric. Meth. t. 258. f. 3. 

 Inhabits the European seas, about the influx of rivers. Linnaus. 

 North Sea. Gronovius. Mediterranean. Chemnitz. Coasts 

 of Britain. Lister, &jc. 

 Shell two inches or two inches and a half long, nearly twice 

 as broad, and the height of the two valves rather exceeds 

 half the length ; it is striated, and more or less strongly 

 ridged transversely, and the colour is yellowish white ; both 

 sides slope a little from the hinge, and the valves do not shut 

 quite close at either end ; the hinge, which is placed much 

 nearer the posterior than the anterior end, has a strong tri- 

 angular primary tooth in one valve, and no lateral teeth. 



hians. 38. Shell oblong, gaping, marked with ir- 

 regular rugged transverse striae, and the up- 

 per margin incurved; hinge without lateral 

 teeth. 



