POLYPLACOPHORA. XXV 



Subgenus Cyanoplax Pils., p. 44. 

 # 



Genus Chsetopleura Shuttlw., p. 27. 

 Genus Pallochiton Dall, p. 256. 

 Genus Dinoplax Cpr., p. 254. 

 * 



Genus Ischnochiton Gray, p. 53. 



Subgenus Stenochiton Ad. & Ang., p. 55. 

 Subgenus Stenoplax Cpr., p. 56. 



Section Stenoradsia Cpr., p. 61. 

 Subgenus Ischnoplax Cpr., p. 64. 

 Subgenus Ischnochiton 8. s. p. 87. 



Section Lepidozona Pils., p. 125. 



Section Radsiella Pils., p. 139. 



Section Ischnoradsia Shuttl., p. 144. 

 Subgenus Heterozona Cpr., p. 65. 



Subfamily Callistoplacinse Pilsbry, p. 259. 



Genus Callistochiton Cpr., p. 260. 

 # 



Genus Nuttallina Cpr., p. 277. 



Subgenus Middendorffia Cpr., p. 282. 

 Genus Craspedochiton Shuttlew., p. 285. 

 * 



Genus Angasia Cpr., p. 286. 

 Genus Callistoplax Cpr., p. 288. 

 Genus Ceratozona Dall, p. 290. 



Family Mopaliidce Pilsbry, p. 292. 



Genus Mopalia Gray, p. 294. 

 Genus Placiphorella Cpr., p. 305. 

 Genus Plaxiphora Gray, p. 311. 



Section Guildingia Cpr., p. 329. 



Section Fremblya H. Ad., p. 330. 

 Subgenus Placophoropsis Pilsbry, p. 313. 



Family Acanthochitidce Pilsbry. 



Genus Spongiochiton Cpr. 

 Genus Acanthochites Risso. 

 Section Notoplax Ad. 



