PLATE IL 



Figs. I — 3. Arca [Bathyarcà] sibogai sp. nov. 3 valves of the type-séries from St. 211. Natural size. 



Fig. 4. Arca [Bathyarcà] sp. A right valve from St. 159. Natural size. 



Figs. 5, 6. Arca [Bathyarcà] sp. Two left valves from St. 212. Natural size. 



Figs. 7, 8. Limopsis lata Smith. A shell from St. 52. X 2. 



Figs. 9, 10. Ltmopsts belcheri (Adams & Reeve). A shell from St. 95. Natural size. 



Figs. Il, 12. Limopsis belcheri (Adams & Reeve). Inner vievvs of the valves figured as figs. 9, 10. Natural size. 



Figs. 13, 14. Limopsis dautzenbergt sp. nov. Two valves of the type-séries from St. 90. X 3- 



Figs. 15 — 18. Glycymeris dautzenbergi sp. nov. Holo- and Paratypes from St. 313. Natural size. 



Figs. 19, 20. Glycymeris maskatensis (Melvill). An adult shell from the Persian Gulf. Natural size. 



Figs. 21 — 24. Brachidontes [Septifer] bilocularis (Linn.). Two shells from St. 50. Natural size. 



Figs. 25, 26. Alodiolus [Modiolus] philippinarum (Hanley). A typical shell from St. 64. Natural size. 



Figs. 27, 28. Alodiolus [Modiolus] fiavidus (Dunker). A typical shell from St. 311. Natural size. 



Figs. 29 — 31. Modiolus [Modiolus] dubius sp. nov. The first two figures are of the Holotype and the third 



of a young left valve from St. 297. X 3- 



Figs. 32, 33. Modiolus [Amygdaluni] ivatsoni Smith. An adult shell from St. 300. Natural size. 



Figs. 34, 35. Musculus cuneatus (Gould). A young shell from St. 37. Natural size. 



Figs. 36, 37. Musculus impactus (Hermann). An adult shell from New Zealand. Natural size. 



Figs. 38, 39. Lithophaga [Lithophaga] ter es (Philippi). An adult shell from St. 71. Natural size. 



Figs. 40, 41. Lithophaga [Lithophaga) nasuta (Philippi). An adult shell from St. 93. Natural size. 



Figs. 42, 43. Lithophaga [Lithophaga] levigata (Quoy & Gaimard). An adult shell from St. 34. Natural size. 



Figs. 44, 45. Solamen sibogae sp. nov. Holotype from St. 5. Natural size. 



Figs. 46 — 49. Vulsella mmor Roding. Two shells from St. 19. Natural size. 



