342 EXPLANATION OF PLATES, XVII. 



FIGURE PAGE 



13. D. ecostatum Hutt. From Macleay Mem. Vol., . .102 



14-18. D. matara Dall. Pilsbry, del.," 105 



PLATE 19. 



1. D. lacteum Dh. From Deshayes, . . . . . .99 



2. D. rubescens Dh. From Deshayes, . . . . .105 



3. D. malzani Dkr. From Clessiu, . . . . .107 



4. D. ambiguum Chenu. From Chenu, . . . . 100 



5. D. translucidum Dh. From Deshayes, . . . .99 



6. D. siculum Dh. From Costa, 107 



7. 8. D. bisinuatum Andre. From Rev. Suisse Zool., . .108 

 9. D. callipeplum Dall. From Blake Rep., . . . .100 



10-15. D. stenoschizum P. & S. Pilsbry, del. . . .128 



16, 17. D. tenuifissum Moots. From Costa, 

 18, 19. D. politum L. From Thes. Conch., 

 20, 21. D. politum L. From Deshayes, . 



22. D. lubricatum Sowb. From Thes. Conch. 



23. D. erectum Sowb. From Thes. Conch., 



PLATE 20. 



129 

 128 

 128 

 110 

 111 



24. D. phaneum Dall. From Proc. U. S. Nat. Mus., . . 59 



25. D. complexum Dall. From Proc. U. S. Nat. Mus., . . 76 



26. D. acutissimum Wats. From Chall. Rep., . . .94 



27. D. segeum Wats. From Chall. Rep., . . . .69 



28. D. attenuatum Sowb. From Thes. Conch., . . . 120 



29. Entalina mirifica Smith. From Ann. Mag., . . . 134 



30. D. sowerbyi Guild. From Tr. Linn. Soc., . . .117 



31. D. philippinarum Sowb. From Thes. Conch., . . . 116 



32. D. philippinarum Sowb. Specimen, 116 



33. D. eburneum L. Specimen, . . . . . .115 



34. D. eburneum L. From Thes. Conch., . . . .115 



35. 36. D. longitrorsum Rve. From Thes. Conch., . .111 



PLATE 21. 



37-39. D. liodon P. & S. Pilsbry, del., 107 



40,40. D. liodon v. alloschismum. Pilsbry, del., . . . 108 

 41, 42. D. liodon v. alloschismum. Pilsbry, del., . . .108 



43. D. aequatorium P. & S. Specimen, ..... 112 



44. D. watsoni P. & S. Specimen, . . . . . .113 



45. D. rectius Cpr. Specimen, . . . . . .113 



46. 46. D. dalli P. & S. Specimen, 114 



47. 48. D. inversum Dh. Pilsbry, del., 95 



49. D. inversum Dh. From Thes. Conch., . . . .95 



