342 



EXPLANATION OF PLATES, XVII. 



FIGURE 



13. D. ecostatum Hutt. From Macleav Mem. Vol., 

 14-18. D. matara Dall. Pilsbry, del.,' . 



PAGE 



102 

 105 



Plate 19. 



1. D. lacteura Dh. From Desbayes, 



2. D. rubescens Dh. From Desbayes, . 



3. D. malzani Dkr. From Clessiu, 



4. D. ambiguum Cbenu. From Cbenu, 



5. D. translucidum Dh. From Deshayes, 



6. D. siculum Dh. From Costa, .... 



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

 9. D. eallipeplum Dall. From Blake Rep., . 



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

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

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

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



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



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



Plate 20. 



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



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



26. D. acutissi mum Wats. From Chall. Rep., 



27. D. iegeum Wats. From Chall. Rep., 



28. D. attenuatura Sowb. From Thes. Conch., 



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



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



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



32. D. philippinarum Sowb. Specimen, . 



33. D. eburneum L. Specimen, 



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



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



Plate 21. 



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



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



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



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



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



45. D. rectius Cpr. Specimen, 



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



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

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



