xii 



CONTENTS. 



Family VI. — Lithophagidce 



32. Saxicava ■ - 



33. Petricola - 



34. Venerupis - 



Family VII. — Nymphidce 



35. Sanguinolaria 



36. Psammobia - 



37. Galeomma - 



38. Tellina 



39. Corbis 



40. Lucina - 



41. Donax - 



42. Capsa - 



Division III.— Conchifera lamellipeda 



Family VIII. — Conchidce 



43. Cyclas 



44. Cyrena 



45. Galathea 



46. Cyprina 



47. Astarte 



48. Cytheria 



49. Venus 



Family IX. — Cardiidce 



50. Cardium 



51. Cardita 



52. Cypricardia - 



53. Isocardia 



Family X. — Arcidce - 



54. Cucullaea 



55. Area - 



56. Pectunculus - 



