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. B. antillarum Orb. Pilsbry, del., . . . .57 



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



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



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



PLATE 15. 



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

 32, 33. D. candid um 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. B. candidum Jeffr. Specimens 72 



PLATE 16. 



41-44, 45, 46. B. sericatum Ball. 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. Soc., . . 90 



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



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



PLATE 17. 



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

 58, 58 and 59, 59. B. calamus Ball. Off Cape Fear. 'Pilsbry, 



del., 97 



60-63. B. sectum Besh. Pilsbry, del., 96 



64. B. novaBhollandise Chenu. From Chenu, . . . .93 

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



PLATE 18. 



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



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



5. B. subrectum Jeffr. Type specimen. Pilsbry, del., .119 

 6-8. B. innumerabile P. & S. Pilsbry, del., . . .119 

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



10. B. perlongum Ball. From Blake Rep., . . . .104 



11. B. perlongum Ball, apex. Pilsbry, del., .... 104 



12. B. caudani LOG. From Locard, 104 



