BIVALVE SHELLS. 33 



10. CyCLINA? UNDATA. B.M. 



C. testa orbiculari, sublenticulari, depressa, subeequilaterali, irre- 

 gulariter transversim striata, alba, ad apices ssepius lutescente ; 

 umbonibus tumidulis, acutis, brevibus ; lunula nulla ; valvis 

 intus candidis ; cardine angusto, in valva dextra bidentato, 

 altero tridentato; sinu pallii maximo, profundissimo, apice 

 obtuso, basi lato, obliquissime ascendente. 

 Venus undata, Penn. Brit. Zool. pl. 58. f. 9. 

 Mont. Test. Brit. p. 117. 

 Donov. Brit. Shells, iv. pl. 121. 

 Mat. Sf' Rack. Linn. Trans. viii. 86. 

 Turt. Conch. Dict. p. 241. f. 94. 

 Flem. Brit. Anim. p. 448. 

 Dillw. Recent Shells, i. 197. 

 Wood, Ind. Test. pl. 8. f. ^7. 

 Phil. Moll. Sicil. ii. 34. 

 Mysia undata, Leach, Brit. Moll. 

 Tellina rotundata? Maton. 

 Petit, Journ. de Conch. 1821, p. 293. 



Venus sinuosa (monstr.), Penn. Brit. Zool. ed. 4. iv, 57. pl. 59. 

 f. 51 A. 



Mont. Test. Brit. p. 120. 

 Mat. 4" Rack. Linn. Trans. viii. 90. 

 Lucina undata, Lamk. An. s. Vert. ed. 2. vi. 229. 

 Turt. Dith. Brit. -p. 115. 

 Thorpe, Brit. Mar. Conch. p. 73. 

 Brown, III. Conch. G. Br.j). 98. pl. 39. f. 1, 2. 

 Hanley, Recent Shells, p. 76. 

 Venus incompta, Phil. Moll. Sicil. i. 44. pl. 4. f. 9. 

 Cytherea undata, Macgill. Moll. Aberd. p. 263. 

 Artemis undata, Alder, Cat. North. and Durham, Moll. p. 84. 

 Lucinopsis undata, Forbes ^- Hanley, Hist. Brit. MolL Luc. 

 p. 435. pt. xi. pl. 28. f. 1, 2; et aniraal, pl. m. f. 2. 



Hab. Oceanus Europseus. 



11. Cyclina tenuis. 



C. testa orbiculari, sequilaterali, laevigata, convexo-depressa, tenui, 

 squalide alba, umbonibus prominentibus, antice mficxis, cas- 

 taneo tinctis ; lunula fere obsoleta, cordato-lanceolata ; valvis 

 intus albidis ; impressione musculari antica angusta. elongata, 

 arcuata, postica ovato-rotundata. 



Recluz, Journ. de Conch. 1852, p. 250. pl. 10. f. 1. 



Hab. Insula Guadalupensis. 



