118 REFERENCE TO PLATES. 



FIGURE. PAGE. 



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



Illustr., . . . 9 



80, 81. Acanthochites discrepans Brown. Conch. Illustr., . 12 



82. Acanthochites discrepans, sculpture x 60. Pilsbry del., . 12 



83. Acanthochites gracilis Jeffr. 111. Incl. Brit. Sh., . . 11 



84. Acanthochites penicillatusDh. Pilsbry del., . . 15 



85. Acanihochites exquisitus v. ampullaceus Pilsbry. Pilsbry 



del., . 24 



86. 97. Acanthochites bisulcatus Pils. Pilsbry del., . . 28 



PLATE 5. 



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



12. Amicula arniculata 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. . . . j 48 



PLATE 7. 



7. Cryptochiton stelleri Midd. Ross del., . . . .48 

 8,9. Cryptochiton stelleri. Two head valves. Emerton del. 48 



10, 11. Cryptochiton stelleri. Two tail valves. Ross del., . 48 



12. Cryptochiton stelleri. Seventh valve. Ross del., . . 48 



13. Cryptochiton stelleri. Second valve. Mai. Ross., . . 48 



PLATE 8. 



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 ernersonii (=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 penicillatus Dh. Moll. Reun., . . 15 

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

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



