20 



186 Crepidula navicelloides Nutt 



Abundant in the interior of dead univalves, varying in size 

 according to the shell occupied. 



In dead bivalves assuming the form nummaria Gould 



187 Crepidula dorsata var lingulata Gld 



Abundant on rocks at La Playa and elsewhere. Very variable 

 in form, but well marked by the form of the deck. 



188 Hipponyx tumens Cpr 



Abundant with the next species. 



189 Hipponyx antiquatus L., var serratus Cpr 



Abundant under stones or shelving rocks, ocean beaches. 



190 Sealaria hindsii Cpr and var subcoronata 



Not common. 



191 Sealaria indianorum Cpr 



Not rare; San Diego. Santa Barbara (Yates). 



192 Sealaria bellastriata Cpr 



Very rare. San Diego. 



193 Opalia crenatoides Cpr 



San Diego; not common. Also Todos Santos bay. 



194 Ianthina bifida Totten 



Specimens often washed ashore at San Diego. 



195 Odostomia nuciformis Cpr var avellana Cpr 

 San Diego. 



196 Odostomia inflata Cpr 



Type locality: — Neeah bay, Washington (Swan). 

 San Diego; not rare. Also a variety (?) more slender and 

 elevated proportionally, but otherwise similar. 



197 Odostomia aequisculpta Cpr 



Abundant on the shells of Haliotis. 

 [San Diego to Cape St. Lucas. D.] 



198 Turbonilla torquata Gld 



Abundant on the shells of Haliotis, San Diego; Todos Santos; 

 Santa Barbara. 



199 Turbonilla aurantia Cpr 



San Diego. Santa Barbara (Yates). 



200 Chrysallida pumila Cpr 



[Rare. Todos Santos. D.] 



201 Obeliscus variegatus Cpr 



San Diego bay; dead specimen; rare. 



203 Lacuna variegata Cpr 



On sea-grass; abundant in spring. 



204 Lacuna unifasciata Cpr 



San Diego. Not common. 



