340 EXPLANATION OF PLATES, XVII. 



FIGURE PAGE 



40. D. abyssorum Sars. From Sars, . . . . .48 

 41-43. D. occidentale Stimp., young. From Verrill, . . 47 



51 

 51 

 52 

 52 

 46 

 41 

 41 

 53 

 53 

 49 



44-46. D. novemcostatum Lam. From Moll. Rouss., 

 47, 48. D. novemcostatum Lam. From Thes. Conch., . 



49. D. alternans (=insequicostatum Dtz). From Moll. Rouss 



50, 51. D. insequicostatum Dautz. Specimen, 



52. D. vagina Jeffr. Jeffreys' type, . . . : * 



53. D. vulgare DaCosta. From Thes. Conch., 



54. D. vulgare DaCosta. Specimen, . . . . 



55. D. dentalis L. From Costa, 



56. 57. D. dentalis L. From Moll. Rouss., . 



58, 59. D. senigmaticum Jord. From Proc. Mai. Soc., . 



PLATE 10. 



60-64. D. oerstedi Morch. Pilsbry, del., . . . .24 



65. D. curtum. From Thes. Conch., 14 



66. D. aculeatum Sowb. From Thes. Conch., . . .61 



67. D. cancellatum Sowb. From Thes. Conch., . . .30 



68. 69. D. usitatum Smith. From Ann. Mag., . . .29 

 70-73. D. oerstedi var. numerosum Dall. Pilsbry, del., . .25 



PLATE 11. 



75-80. D. neohexagonum P. & S. Pilsbry, del., . . .19 

 1-86. D. neohexagonum P. & S. var. Pilsbry, del, . .19 



S7. D. picteti Desh. From Chenu, 22 



88, 89. D. intercalatum Gld. Type specimen, Pilsbry, del., . 23 



PLATE 12. 



90-94. D. agassizi P. & S. Pilsbry, del., . . . . 26 

 95-97. D. magellanicum P. & S. Pilsbry, del., . , .28 

 98, 99. D. majorinum M. & R. Moll. Cap Horn, ... 27 

 100. D. shoplandi Jouss. Pilsbry, del., 28 



PLATE 13. 



1, 2, 3. D. pretiosum Nutt. Pilsbry, del., . . . .44 



4-8. D. pretiosum var. indianorum Cpr. Pilsbry, del., . 45 



9-11. D. occidentale Stimps. Pilsbry, del., . . . .47 



12. D. dacostianum Chenu. From 111. Conch., . . . 61 



13-15. D. senegalense Dautz. Mem. Soc. Zool. Fr., . . 55 



PLATE 14. 



16-18. D. disparile Orb. Pilsbry, del., . . . . .56 

 19. D. disparile Orb. Moll. Cuba, . . . . . ,. . 56 



