782 



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

 Phil. Abbild. Ast. tab. 1. f. 12? 



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

 margine intus Isevi. 



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. Y. Mon- 

 tagui, Billivijn, Eecent Shells. Cyprina compressa, Tiirt. As- 

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

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



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

 tricc minute lirata, liris iionnunquam medio et ad marginem ven- 

 tralem obsoletis ; margine intiis Iffivi ; epidermide tenui, olivacea. 



Kather trigonal, sometimes even higher than long, "with the 

 concentric riblets very minute, and in some cases obsolete. 



Great Britain and Norway. 



13. AsTARTE TRiANGULAR,is (pi. clxvii. f. 9), Montagii. 

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

 tissima, Mont. Test. Suppl. Goodallia triangularis, Turt. Mac- 

 trina triangularis, Bruivu. 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), GouM, Invert. 



Mass. p. 81. f. 48. 



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

 sen tenuissime striata ; margine intus Ifevi. 



A small trigonal flattish 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? Broder'q^ and Sotoerby, 

 Zool. Journ. (1828, 1829). 



