- ]. 



the molluscs, biit also amoA? other groups, esoeciaily the eorals. 



OoGu.rrence .- Oligocene.- Santo Domingo (Dall, 1898^. 

 lower Mioeene: Bowden beds, 'Bowden, Jamaica. (Dall, 1898). T'io- 

 cene(?).- 3erros Island, off lov/er California ("aho, 1869; Dall, 

 1898). Post PlioceneC?).- Parto, Peru (Gahh, 1869). Post 

 Pliocene (?).- San Bruno, east side of peninsula of Lower Oali- 

 forni (Gahb, 1869). Recent.- Oulf of California at Acapiilco and 

 southv-ard (Dall, 1898). 



