^ 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 



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 lasvi, dentibus lateralibus 



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



Concha longa lata<^ue In mediis cardinibus cavitate quadam pyriformi 

 insignita. — An Chamte glycymeris Rondeletii ? 



List. LI. Angl. p. no. ///. \9.tab. 4./^. 19.— 



Chama fusca lata planior. Hist. CojicIl. tab. 415. 

 fig. 259. 

 The long and broad conch. Wallis Northumb. p. 396. No. 10. 1 J. 

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



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

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



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



