782 



App. ; Gray, Zool. Beech, pi. 44. f. 10. Ast. pulchella, Jonas, 

 Phil. Abbil'd. Ast. tab. 1. f. 12? 



Ast. testa inflata, cordato-rotundata, alta, creberrime lirata; 

 margine intus kevi. 



A small cordate species, with very numerous regular ribs, like 

 A. compressa, but more inflated, more cordate, the ribs more dis- 

 tinct and regular, and the lunule and dorsal area more defined and 

 excavated. 



Greenland. 



12. Astarte compressa (pi. clxvii. f. 6, 7), Montagu. Ve- 

 nus compressa, Test. Brit. Suppl. p. 43. pi. 26. f. 1. V. Mon- 

 tagui, Dillwyn, Becent Shells. Cyprina compressa, Tart. As- 

 tarte striata, Gray, App. Beech. Voy. pi. 44. f. 9. A. multicosta, 

 Macgillivray, Ph. Abbild. Ast. tab. 1. f. 8? 



Ast. testa subtrigona, compressa, plerumque altiorc, concen- 

 trice minute lirata, liris nonnunquam medio et ad marginem ven- 

 tralem obsoletis ; margine intus laevi ; epidermide tenui, olivacea. 



Bather trigonal, sometimes even higher than long, with the 

 concentric riblets very minute, and in some cases obsolete. 



Great Britain and Norway. 



13. Astarte triangularis (pi. clxvii. f. 9), Montagu. 

 Mactra triangularis, Test. Brit. p. 99. pi. 3. f. 5. Mactra minu- 

 tissima, Moid. Test. Suppl. Goodallia triangularis, Tart. Mac- 

 trina triangularis, Brown. A. triquetra, ? 



Ast. testa parva, trigona, inflata, alta, polita; margine crenu- 

 lato. 



More inflated, smaller, and higher from beak to ventral margin, 

 than A. quadrans, with the margin finely crenulated. 

 North Britain. 



14. Astarte quadrans (pi. clxvii. f. 5), Gould, Invert. 

 Mass. p. 81. f. 48. 



Ast. testa trigona, compressa, subaequilatera, tenui, laevigata, 

 seu tenuissime striata ; margine intus kevi. 



A small trigonal flattisli shell, nearly equilateral and nearly 

 smooth. 



North America. 



15. Astarte castanea (pi. clxvii. f. 14, 15), Say, Amer. 

 Conch, pi. 1 (1830). An Ast. crassidens? Broclerip and Sowerby, 

 Zool. Journ. (1828, 1829). 



