i \i-i \- - 335 



1 :;. iromiarthnini srtulosuni Cpr. Moll. > ' . . 20 



4-8. Qemiarthrom wtolotum Q>r, Kmrrton <!.!., 



I'I.MI. ;. 



9-11. Mirroplax ^rayi Al. A' An-. K. A. Smith del., . 21 



12-H). Ilanli'va ti-MpHMlis Dull. Km.Tton del., . . .19 

 17, IS. II:uilry:itr..picalis Dall. ' I5l:.k- ' Moll., . . . !'. 



19, 21. Trachydrrmon sU-im-nii I'liV. Moll. S. (ieorg., . 

 22-24. Trachydermon lividus Mi<ld. Mai. Ross., . . 76 



25-27. Trarhydennon cincreus L. Moll. Reg. Arct., . 



28. Trachydermon cinereus L. Ross del., . . . , 6fl 



29, 30. Trachyderinoii cinereus L. Pilsbry del., ... 68 

 31. Trachydermon cinereus L. Hist. Br. Moll., . . .68 

 32-34. Trachydermon allms L. (head and tail valves badly 



drawn). Emerton del., 70 



PLATE 7. 



35. Trachydermon albus L. Moll. Reg. Arct., . . 70 



36-38. Trachydermon albus L. Pilsbry del., . . 70 



39-45. Trachydermon exaratus Sars. Moll. Reg. Arct, 71 



46-49. Trachydermon exaratus Sars. Tr. Conn. Acad., 71 



50-56. Trachydermon ruber L. Moll. Reg. Arct., . 80 



57. Trachydermon cinereus L. Pilsbry del., . . 68 



58. Trachydermon cinereus var. variegatus Phil. Moll. Sicil. 69 

 59-60. Trachydermon cinereus var. variegatus Phil. Moll 



Rouss., 69 



PLATE 8. 



61-65. Trachydermon dentiens Gould. Pilsbry del., . . 73 



66-68. Trachydermon scrobiculatus Midd. Mai. Ross., . 76 



69, 70. Trachydermon pusillus Sowb. Conch. Icon., . . 80 



71. Trachydermon stramineus Sowb. Conch. 111., . . 79 



72, 73. Trachydermon virgatus Rv. Conch. Icon., . . 78 

 74, 75. Trachydermon virescens Rv. Conch. Icon., . . 7 s 

 76, 77. Trachydermon puniceus Couth. Expl. Exped., , 81 

 78, 79. Chsetopleura cullierti Rochebr. Moll. Cap Horn, 



[See Appendix 



80, 82. Callochiton fulgetrum Reeve. Conch. Icon., . . 83 



81. Cal loch i ton fulgetrum Reeve. Cpr. del., . . . .83 

 83-85. Callochiton lobatus Cpr. Emertou del., . . .53 



PLATE 9. 



86, 87, 91. Callochiton castaneus Wood. Conch. 111., . . 52 



88, 89, 90. Callochiton castnneus Wood. Pilsbry del., . . 52 



92. Callochiton illuminatiis Rve. Emerton del., . . .51 



93, 94. Callochiton illumiuatus Rve. Conch. Icon., . . 51 



