i \I-I.\N M i. N MI- PLJ 



* 



l'l.\ I ! 



1. Onjthocbiton lyellii 8owb. ('..ndi. IIIu*tr 247 



2. Onitbocbiton lyelli) Sowb. Condi. Icon., . . . LM? 

 3-7. Onitbocbiton lyellii 8owb, Bmerton del., . . .247 



8,9. Onithodiiton iiidi IIv. ( lydlii S.w!).). Conch. Icon., 248 

 10, 11. Onithudiitoii srmisnrlptus Pils. Koss del., . ,247 

 12, 13. Onithudiitoii <|iirrdmis(;l<l. I'. S. Kxped., 

 14, 1."). ( )nitlmdiit<m undulatus Q. & G. Roes del, . .245 

 L6. Onitbocbhon undulatas Q. ft G. Voy. Astrol., . .240 

 17, 18. Plaxiphora wahlbergi Kr. sndaf. Moll., . . .322 



19. Onithoehiton ragulotns Anff. P. Z. S., . . . .249 



20. Onithoehiton maillardi Desh. Moll. Reun., . . . 250 

 21-23. Onithoehiton literatus Kr. Sudafrik. Moll., . . 251 



PLATE 56. 



1, 4, 6. Pallochiton lanuginosus Cpr. Ross del., . . 257 



2, 3. Pallochiton lanuginosus Cpr. Pilsbry del., . . 257 

 5, 7-11. Pallochiton lunuginosus Cpr. Emerton del., . . 2~>7 



12-16. Nuttallina californica Nutt. Emerton del., . . 279 

 17, 18. Nuttallina californica Nutt. Ross del., . . .279 

 19, 20. Nuttallina scabra Rve. Ross del., . . . .280 



PLATE 57. 



21. Dinoplax gigas Gmel. Conch. Icon., .... 255 



22. 27-31. Dinoplax gigas Gmel. Emerton del., . . . 255 

 23-26. Dinoplax gigas Gmel. (young). Siidafrik. Moll., . 255 



32. Dinoplax gigas Gmel. (young). Ross del., . . . 255 



33. 35. Tonicia confossa Gld. Pilsbry del., . . . .210 



34. Tonicia confossa Gld. U. S. Expl. Exped., . . .210 



PLATE 58. 



1, 2. Callistochiton crassicostatus Pils. Emerton del., . . 264 

 3-6. Callistochiton crassicostatus Pils. Pilsbry del., . . 264 

 Fig. below 1, and 7, 8. Callistochiton palmulatus Cpr. Emerton 



del., . . . . . . . . . .262 



9-11. Callistochiton palmulatus var. mirabilis Pils. Pilsbry 



del., 263 



12. Callistochiton palmulatus (typical). Pilsbry del., . . 262 

 13-16. Callistochiton palmulatus (typical). Emerton del., . 262 

 17. Callistochiton decoratus Cpr. Ross del., . . . 269 



18-20. Callistochiton decoratus Cpr. Pilsbry del., . . 269 

 21, 22. Plaxiphora ccelata Rve. Conch. Icon., . . .328 



PLATE 59 



21-26. Callistochiton pulchrior Cpr. (=pulchellus Gray). 



Foord del., . . 272 



