EXPLANATION OF PLATES, XVII. 341 



FIGURE PAGE 



20, 21. D. disparile Orb., apices of two specimens. Pilsbry, 



del., 56 



22. D. antillarum Orb. Moll. Cuba, 57 



23-25. D. antillarum Orb. Pilsbry, del., . . . .57 



26. D. variabile Dh. From Thes. Conch., . . . .60 



27, 28. D. variabile Dh. Pilsbry, del., 60 



29, 30. D. belcheri Sowb. Thes. Conch., .... 60 



PLATE 15. 



29-31. D. megathyris Dall. Pilsbry, del., . . . .67 

 32, 33. D. candidum var. meridionale P. & S. Pilsbry, del., . 73 



34. D. candidum var. meridionale P. & S. Apex of another 



specimen. Pilsbry, del., . . . ... 73 



35, 36. D. ergasticum Fisch. From Locard, . . .74 



37. D. ensiforme Chenu. From Chenu, . . . . .101 



38. D. splendidum Sowb. From Thes. Conch., . . .96 



39. 40. D. candidum Jeffr. Specimens. . . 72 



PLATE 16. 



41-44, 45, 46. D. sericatum Dall. Pilsbry, del., ... 86 

 47-49. D. eboreum Conr. Type specimen. Pilsbry del., . 89 

 50. D. leptum Bush. From Tr. Conn. Acad., 

 51-53. D. semistriatum Gldg. From Tr. Linn. Soc., . . 90 



54. D. semipolitum B. & S. From Thes. Conch., . 



55, 56. D. eboreum Conr. Specimens, . , .89 



PLATE 17. 



55-57. D. calamus Dall. Frying Pan Shoal. Pilsbry, del., . 97 

 58, 58 and 59, 59. D. calamus Dall. Off Cape Fear. Pilsbry, 



del., 97 



60-63. D. sectum Desh. Pilsbry, del., . . . .,.. . 96 

 64. D. novsehollandise Chenu. From Chenu, . . .93 



65-67. D. aciculum Gld. Type specimen. Pilsbry, del., . 93 



PLATE 18. 



1-3. D. longum S. & P. Pilsbry, del., 120 



4. D. fistula Sowb. From Thes. Conch., . . 118 



5. D. subrectum Jeffr. Type specimen. Pilsbry, del., . 1 

 6-8. D. innumerabile P. & S. Pilsbry, del., 



9. D. filum Sowb. From Journ. de Conch., . . . 118 



10. D. perlongum Dall. From Blake Rep., . . . .104 



11. D. perlongum Dall, apex. Pilsbry, del., . 



12. D. caudani Loc. From Locard, 104 



