40 TERTIARY AND yl'ATERNAEY PECTENS OF CALIFORNIA. 



Sumiiiiiri/ of range of specie.t and mrieties. 



Species found in the Eocene 4 



Species found only in the Eocene 4 



Species transitional between the Eocene and Oligooene None. 



Sijei'ies foiin<l in the Oligocene 5 



Species found only in the Oligocene None. 



Species transitional between the Oligocene and Miocene o 



Species found in the Miocene 32 



Varieties found in the Miocene 6 



Si)ecies foinid only in the Miocene 23 



Varieties found only in the Miocene 5 



Species doubtfully Miocene 1 



Species transitional between the Miocene and Pliocene 4 



Varieties transitional between the Miocene and Pliocene 2 



Species doubtfully transitional 1 



Species found in the Pliocene 31 



Varieties found in the Pliocene 6 



Species found only in the Pliocene 23 



Species doubtfully Pliocene 2 



Species transitional between the Pliocene and Pleistocene 7 



Varieties transitional between the Pliocene and Pleistocene 3 



Species doubtfully transitional 2 



Species found in the Pleistocene 11 



Varieties found in the Pleistocene 9 



jSpecies found only in the Pleistocene 1 ( ?) 



Varieties found only in the Pleistocene ] 



Species transitional between Pleistocene and Recent 9 



Varieties transitional between Pleistocene ami Recent 8 



Species found in the Recent fauna 15 



Varieties found in the Recent fauna 1 11 



Species found only in the Recent fauna 7 



Varieties found only in the Recent fauna 2 



Species found from Recent to Pliocene fauna ( 1 doubtful ) (j 



Varieties found from Recent to Pliocene fauna 4 



Species found from Recent to Miocene fauna ] 



Varieties found from Recent to Miocene fauna 1 



