340 EXPLANATION OF PLATES, XVII. 



FIGURE PAGE 



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

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

 44-46. D. novemcostatum Lam. From Moll. Rouss., . . 51 

 47, 48. D. novemcostatum Lam. From Thes. Conch., . . 51 



49. D. alternans (=insequicostatum Dtz). From Moll. Rouss., 52 



50, 51. D. ina3quicostatum Dautz. Specimen, . . .52 



52. D. vagina Jeffr. Jeffreys' type, . . . . .46 



53. D. vulgare DaCosta. From Thes. Conch., . . .41 



54. D. vulgare DaCosta. Specimen, 41 



55. D. dentalis L. From Costa, ...... 53 



56. 57. D. dentalis L. From Moll. Rouss., . . . .53 

 58, 59. D. senigmaticum Jord. From Proc. Mai. Soc., . . 49 



PLATE 10. 



60-64. D. cerstedi 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 

 81-86. D. neohexagonum P. & S. var. Pilsbry, del., . . 19 



87. D. pictet.i 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, . 

 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., 



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 



