EXPLANATION OF PLATES. 335 



1-3. Hemiarthrum setulosum Cpr. Moll. S. Georg., . . 20 

 4-8. Hemiarthrum setulosum Cpr. Emerton del., . . 20 



PLATE 6. 



9-11. Microplax grayi Ad. & Aug. E. A. Smith del., . 21 

 12-16. Hanleya tropicalis Dall. Emerton del., . . .19 

 17, 18. Hanleya tropicalis Dall. ' Blake ' Moll., ... 19 

 19, 21. Trachydermon steinenii PfFr. Moll. S. Georg., . . 82 

 22-24. Trachydermon lividus Midd. Mai. Ross., . . 76 



25-27. Trachydermon cinereus L. Moll. Reg. Arct., . . 68 



28. Trachydermon cinereus L. Ross del., . . . .68 



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

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

 32-34. Trachydermon albus 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. Trachydermou 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 stramiueus Sowb. Conch. 111., . . 79 



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

 74, 75. Trachydermon virescens Rv. Conch. Icon., . . 78 

 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. Callochiton fulgetrum Reeve. Cpr. del., . . . .83 

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



PLATE 9. 



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



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



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



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



