1341. 
1342. 
Mist. OR= SPECIES 349 
I. radians, Cpr., Monterey, Pt. San Pedro. 
I. scabricostatus, Cpr., Catalina Is. 
I. reteporosus, Cpr., San Pedro, Victoria. 
I. veredentiens, Cpr., Catalina Is. 
I. aureotinctus, Cpr., Catalina Is. 
I. decipiens, Cpr., Monterey. 
I. corrugatus, Cpr., Catalina Is. 
I. mertensii, Midd., Sitka to Monterey. 
I. cooperi, Cpr., Bolinas to Santa Cruz. 
I. clathratus, Rve., Monterey to La Paz. 
I. sinudentatus, Cpr., Monterey. 
I. regularis, Cpr., Monterey. 
I. trifidus, Cpr., Sitka to Puget Sound. 
Subfamily, CALLISTOPLACINAE 
Genus, callistochiton, Cpr. 
C. palmulatus, Cpr., Monterey; Sta. Bar- 
bara. 
var. mirabilis, Pils., San Diego. 
C. crassicostatus, Pils., Monterey. 
Genus, wuttallina, Carpenter 
N. californica, Nutt., Vancouver Is. to Pt. 
Conception. 
N. scabra, Rve., Pt. Conception southward. 
N. thomasi, Pilsbry. 
Family, MOPALIDAE 
Genus, mopalia, Gray 
M. muscosa, Gld., Shumagin Is. to San 
Diego. 
var. porifera, Pils., Bolinas and S. F. 
var. acuta, Cpr., Sta. Barbara, San 
Diego. 
