120 



The Bonaces are distributed somewhat promiscuously throughout the tem- 

 perate and tropical seas. There are three British species. 



1. acuminata, Desk. 24. 



2. acutangula, id. 25. 



3. senea, Morch. 26. 



4. affinis, Desk. 27. 



5. anatinus, Lam. 28. 



6. asper, Haul. 29. 



7. bella, Desk. 30. 



8. bicolor, Lam. 31. 

 9..bitincta, Reeve. 32. 



10. Californica, Conr. 33. 



11. carinata, Hani. 34. 



12. Cayennensis, Za»a. 35. 



13. clathrata, Desk. 36. 



14. columbella, Lam. 37. 



15. compressa, id. 38. 



16. Conradi, Desk. 39. 



17. contusa, ifce»£. 40. 



18. culter, Hani. 41. 



19. cuneata, Linn. 42. 



20. deltoides, Lam. 43. 



21. denticulata, Linn. 44. 



22. dentifera, Ifa;^. 45. 



23. Dysoni, Desk. 46. 



Species. 



gracilis, Hani. 47. 



granifera, Desli. 48. 



Hanleyana, i7«7. 49, 



incarnata, Chemn. 50. 

 incerata, Reeve. 51. 



intervupta, Ztes//. 52. 



introradiata, Reeve. 53 

 Lamarckii, Ztes#. 54. 



laevigata, «V/. 55 



lubrica, ZTaw^. 56, 



lunularis, Phil. 57 



Madagascariensis, JFd.BS 

 meta, Reeve. 

 navicula, ZTaraZ. 

 nitida, Desk. 

 Nuculoides, Reeve. 

 obesa, D'Orb. 

 obesula, Desk. 

 obscura, Reeve. 

 ovalina, Des7t. 

 Owenii, Gray. 

 paxillus, Reeve. 

 Peiiiviana, Desk. 



59, 

 60, 

 61. 

 62, 

 63. 

 64. 

 65. 

 66, 

 67 

 68 

 69, 



petallina, Desk. 

 pobta, Poli. 

 pulchella, Hani. 

 punctato-striata, id. 

 radians, Lam. 

 rugosa, Linn. 

 saxulum, Reeve. 

 scapellum, Gray. 

 scortum, Linn. 

 semistriata, Poli. 

 semisulcata, Hani. 

 serra, Chemn. 

 sordida, Reeve. 

 spicnlum, id. 

 striatella, Desk. 

 Ticaonica, Hani. 

 transversa, Soto. 

 trifasciata, Reeve. 

 trunculus, Linn. 

 variabilis, Say. 

 variegata, Reeve. 

 vellicata, id. 

 venusta, Poli. 



Figure. 



Don ax deltoides. PI. 37. Tig. 203. Shell of triangular wedge- shape 

 form, with left valve dropped to show the hinge. 



Genus 2. IPHIGENIA, Schumacher. 



Animal ; presumed to be nearly allied to Donax. 



Shell; triangularly ovate, nearly equilateral; hinge composed of 



two cardinal teeth in the right valve, and one cardinal and two 



nearly obsolete lateral teeth in the other. 



