478 SIBERIAN TROPICAL MIOCENE FOSSILS DALL. 



latioii, the presence of a warm water Old Miooene in eastern Siberia, 

 such as our present fossils indioate, would be quite sutticient to prove 

 that no polar conditions in the modern sense could have existed there 

 during- that epoch of geological time. 



ri.ATK 1,VI. 



Fig. 1. Cerithiinn (ipnatophorum l>all, Ion. of original :>."> millimi'tiTs. I'agt^ 475. 

 '2. Siphonarin ptiijina' l>all. Ion. of shell L'O millimotois. Pago 47.5. 



3. Diloma (Chlorodiloma) ntdtratd Dall, alt. of shell 15 millimotors. Tagt* 47(>. 



4. Conns okhotcnsis Dall. alt. of shell 50 iiiillimotors. Page 475. 



5. Semcle Stimpsoiti Dall. loft valve, Ion. of original ;>;> milliineter.s. Page 473. 



