118 REFERENCE TO PLATES. 



FIGURE. 



79. Acanthochites fascicularis L. side view of valve. Conch 



Illustr., 



80, 81. Acautbochites discrepans Brown. Conch. Illustr., 



82. Acanthochites di=crepans, sculpture x 60. Pilsbry del., 



83. Acanthochites gracilis Jeffr. 111. Ind. Brit. Sh., 



84. Acanthochites penicillatus Dh. Pilsbry del., 



85. Acanthochites exquiaitusv. ampullaceusPilsbrv. Pilsbry 



del., ... . . . . 



86. 97. Acanthochites bisulcatus Pils. Pilsbry del., 



Plate 5. 



Plate 7. 



7. Cryptochiton stelleri Midd. Ross del., . 

 8,9. Cryptochiton stelleri. Two head valves. Einerton del 

 10, 11. Cryptochiton stelleri. Two tail valves. Ross del., 



12. Cryptochiton stelleri. Seventh valve. Ross del., . 



13, Cryptochiton stelleri. Second valve. Mai. Ross., . 



Plate 8. 



9 

 12 

 12 

 11 

 15 



24 



28 



1-11, Amicula pallasi Midd. Sib. Reis., . . . .45 



12. Amicula ainiculata Cpr. Emerton del., . . . .47 



13, 14. Amicula amiculata Cpr. Emerton del., . . .47 

 15, 16. Amicula amiculata Pallas. After Pallas, . . .46 



Plate 6. 



1-5. Cryptochiton stelleri var. violaceus Nordm. After 



Nordmann, ......... 50 



6. Cryptochiton stelleri Midd. Four square mill, of surface 



magnified showing bunches of spicules. . . . .48 



48 

 48 

 48 

 48 

 48 



14. Cryptoplax striatus var. gunnii Rv. Conch. Icon., . 54 



15. Choneplax latus Guild. Conch. Icon., . . . .60 

 16-19. Choneplax hastatus Sowb. Ann. Mag., . . .60 

 20, 21. Choneplax hastatus Sowb. Conch. Icon., . . .60 



22. Choneplax hastatus. Head, median and tail valve. Car- 



penter del., ......... 60 



23. Amicula emersonii (=vestita). Emerton del., . . 43 



24. 26. Amicula vestita Sowb. Conch. Illustr., . . .43 



25. Amicula vestita Sowb. Conch. Icon., . . . .43 

 27, 28. Acanthochites acutirostratus Rv. Conch. Icon., . 33 

 29, 30. Acanthochites ])enicil]atus Dh. Moll. Reun., . . 15 

 31,32. Acanthochites stygma Rochebr. ]Moll. Cap Horn, . 27 

 33, 34. Acanthochites adansoni Rochebr. Nouv. Arch., . 13 



