340 



EXPLANATION OF PLATES, XVII. 



FIGURE • 



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

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

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

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



49. D. alternans (=in£equicostatum Dtz). From Moll. Rouss. 



50, 51. D. insequicostatum Duutz. 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. penigmaticum Jord. From Proc. Mai. Soc, 



Plate 10. 



PAGE 



48 

 47 

 51 

 51 

 52 

 52 

 46 

 41 

 41 

 53 

 53 

 49 



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



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



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



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



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

 70-73. D. oerstedi var. uumerosum Dall. Pilsbry, del., 



Plate 11. 



24 

 14 

 61 

 30 

 29 

 25 



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



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



87. 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. disparileOrb. Moll. Culta, 56 



