Lawson.] 



Coast of Northern California 



Thracia trapesoides, Con., Mio. — PI. 

 Modiola multiradidta, Gabb, Mio. — PI, 

 Mytilns Calif or nianus i Con., PI — Rec. 

 Saxidoiuus gibbosus, Gabb, PI. 

 Yoldia impressa, Con., Mio. — Rec. 

 Bala nits sp. 



Neptwica altispira, Gabb, PI. 

 Neptunca tabulata, Baird, Mio. — Rec. 

 Drillia Voyi, Gabb, PI. 

 Olivclla bmtica, Cpr., PI.— Rec. 

 Liinatia pallida, Brod. ami Su b., l'l. — Rec. 

 Purpura canalicidata, Duclos, PI. — Rec. 

 Colun ibcl la Richthofeni, Gabb, PI. 

 Scutella interlineata, Stimp. , PI. 

 Cancer Breiveri(f) Gabb, Mio. — PI. 

 Nassa fossata, Gould, Mio. — Rec. 

 Cardinal blandum, Gould, Mio. — Rec. 

 Psephis (Lordi ? Baird) PI.— Rec. 

 Standclla (planulata ? Con.). PI. — Rec. 

 Natica clausa, Brod. and Sub., PI. — Rec. 

 Fiisns nov. sp., PI. 

 Mactra sp. 



Area sulcicosta, Gabb, PL 

 Priscofusns Oregonensis, Con., Mio. — PL 

 Priscofusus devinctus, Con., Mio. — PL 

 Priene Oregonensis (f ), Redf. , PI — Rec. 



Of these 36 species only 14, or 39 per cent., are extinct. There 

 are, moreover, 18 species which are not known in the Miocene. 

 There is, therefore, no doubt as to the Pliocene age of the beds in 

 which they are found. 



Diastrophism. — From the observations above recorded it appears 

 "lear that (1) in Pliocene time the coast in the northern part of Cali- 



