EXPLANATION OF PLATES, XVII. 



341 



FIGURE 



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



del., 



22. D. antilhuum Orb. Moll. Cuba, 

 23-25. D. antillarura Orb. Pilsbry, del., 



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



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

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



Pilsbry, 



56 

 57 

 57 

 60 

 60 

 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. I), candidum JefTr. Specimens 72 



Plate 16. 



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



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



50. D. leptum Bush. From Tr. Conn. Acad., . . .89 



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



54. D. semipolitum B. & S. From Thes. Conch., . . .91 



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



Plate 17. 



55-57. D. calamus Dall. Frying Pan Shoal. Pilsbrv, 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. novsehollandipe Chenu. From Chenu, . . . ,93 

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



Plate 18. 



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



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



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

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



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



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



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



12. D. caudaui Loc. From Locard, 



del. 



120 

 118 

 119 

 119 

 118 

 104 

 104 

 104 



