22 GEOGRAPHICAL CATALOGUE 



414 Mopalia Hindsii Gray. 

 Str. Fuca to Monterey. 



415 Mopalia Simpsonii Gray. 

 San Francisco, California. 



416 Mopalia vespertina Gld. 

 Str. Fuca to Monterey, Cal. 



417 Mopalia lignosa Gld. 

 Str. Fuca to Monterey Sitka. 



418 Mopalia acuta Cpr. 



" Monterey," (Nuttall coll.) 



419 Mopalia? siuuata Cpr. 

 Str. Fuca, W. T. 



420 Mopalia? imporcata Cpr. 

 Str. Fuca, W. T. 



421 Acanthopleura scabra Rve. 

 Str. Fuca to Santa Barbara. 



422 Acanthopleura fluxa Cpr. 

 Catalina I., or Santa Barbara 1., Cal. 



423 Ischnochiton Magdalensis lids. 

 Monterey to San Diego Lower Cal. 



424 Ischnochiton veredentiens Cpr. 

 Monterey, or islands off South California. 



425 Lepidopleurus regularis Cpr. 

 Monterey or southward. 



426 Lepidopleurus scabricostatus Cpr. 

 Catalina I., 20 fins., rare. 



427 Lepidopleurus pectinatus Cpr. 

 Catalina I., 1. w., rare. 



428 Lepidopleurus Mertensii Midd. 

 Str. Fuca to Monterey. 



429 Trachydermon retiporosus Cpr. 

 Str. Fuca, W. T. 



30 Trachydermon interstinctus Gld. 

 Puget's Sound to Monterey. 



431 Trachydermon trilidus Cpr. 

 Str. Fuca, W. T. 



432 Trachydermon dentiens Gld. 

 Puget's Sound, W. T. ? 



433 Trachydermon pseudodentiens Cpr. 

 Str. Fuca, W. T. 



434 Trachydermon gothicus Cpr. 

 Catalina I., 20 fms., 1. w. ? 



435 Trachydermon Hartwegii Cpr. 

 San Francisco to Monterey. 



