112 



Hemisphere, ranging from Australia to our own shores, on which the 

 genus has its northern limit in T. lincta and exoleta. Three light inflated 

 species, without a lunule, are referred to genus Lucinopsis. 



1. Adansoni, Phil. 



2. Africana, Gray. 



3. alata, Reeve. 



4. Amphidesuioides, id. 



5. angulosa, Phil. 



6. anus, id. 



7. aspera, Reeve. 



8. bilunata, Gray. 



9. biscocta, Reeve. 



10. cserulea, id. 



11. calcalus, id. 



12. canaliculata, Soiv. 



13. Chinensis, Chemn. 



14. compta, Loven. 



15. concentrica, Gmel. 



16. concinna, Sow. 



17. contusa, Reeve. 



18. corrugata, w?. 



19. cretacea, id. 



20. Cuuiiugii, /rf. 



21. discus, id. 



22. distans, ? 



23. Dunkeri, P/«7. 



24. duplicata, Reeve. 



25. exasperata, P/W7. 



Species. 



26. excisa, Chemn. 



27. exoleta, Z»«. 



28. ferrugiiiea, Reeve. 



29. fibula, & 



30. glauca, id. 



31. Graneri, P^7. 



32. hepatica, id. 



33. incisa, Reeve. 



34. Isocardia, Dunk. 



35. Japonica, Reeve. 



36. juvenilis, GW/. 



37. juvenis, Chemn. 



38. lamellata, Reeve. 



39. laminata, /i7. 



40. lenticularis, $?«?. 



41. lincta, P«^. 



42. Urata, Soto. 



43. livida, PM 



44. Lucinoides, Reeve. 



45. luuaris, Lam. 



46. modesta, Reeve. 



47. nanus, zW. 



48. nitens, «c?. 



49. Orbignii, Dunk. 



50. orientalis-, Sow. 



51. Patagonica, P/W7. 



52. penicillata, Reeve. 



53. plana, i^. 



54. ponderosa, Crray. 



55. prostrata, Linn. 



56. pubescens, P/W7. 



57. radiata, Reeve. 



58. rubicund a, P/h7. 



59. rufa, Lam. 



60. scabriuscula, Phil. 



61. scalaris, Menke. 



62. sculp ta, Reeve. 



63. sericea, «¥. 



64. Sieboldii, zW. 



65. simplex, Hani. 



66. sinuata, 2Yr£. 



67. solidula, Sow. 



68. striatissima, ie?. 



69. subrosea, Gray. 



70. subtrigona, Sow. 



71. tenuilamellata, a?. 



72. tenuis, id. 



73. torrida, Reeve. 



74. trigona, &'«?. 



75. variegata, Gray. 



Genus 5. LUCINOPSIS, /We* and Hartley. 



Animal ; suborbicular, its mantle freely open, the margins entire ; 

 siphonal tubes short, diverging, separate, the branchial siphon 

 with its orifice fringed, the anal simple ; foot lanceolate. 

 (Forbes.) 



Shell ; thin, rather inflated, squarely orbicular, slightly flexuous, 

 dull white tinged with rust, surface finely, but irregularly, con- 

 centrically striated ; hinge composed of two diverging teeth, — 



