PLATE LVIIL 



MACTRA LUTRARIA* 



GENERIC CHARACTER. 



Animal a Tethys. Bivalve, sides unequal. Middle tooth compli- 

 cated, with a little groove on each side ; lateral teeth remote. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell oblong oval, smooth; no lateral teeth. Hinge, a small and 

 large triangular cavity in one valve ; a similar cavity and an elevated 

 triangular tooth in the opposite. 



Mactra lutraria : testa ovali oblonga lsvi, dentibus lateralibus 



nullis. Gmel. Linn. Syst.p. 3259. sp. 14. 



Concha longa lataque in mediis cardinibus cavitate quadam pyriformi 

 insignita. — An Chamae glycymeris Rondeletii ? 



List. H. Angl p. 170. tit. 19. tab. 4. fig. 19.— 



Chama fusca lata planior. Hist. Conch, tab. 415. 



fig. 259. 

 The long and broad conch. Wallis Northumb. p. 396. No, 10. 11. 

 Mactra lutraria, large. Penn. Br. Zool. No. 44. tab. 52. fig. 44. 



Chemnitz. Conch. 6. t. 24./. 240. 241. 

 Chama magna planior, crassa, albescens, Magna. Da Costa Br. 



Conch, p. 230. sp. 55. tab. 17. fig. 4. 



