EXPLANATION OF PLATE 13 

 Fauna of Martinez Eocene 

 Fig. 1. Architectonica, sp. X 1. 



Fig. 2a. Architectonica tuberculata Weaver, after Weaver. X 1. 



Fig. 2b. Architectonica tuberculata Weaver. Detail. X 6. 



Fig. 3a. Natica (Gyrodes) lineata, n. sp. X 1.' 



Fig. 3b. Natica (Gyrodes) , sp. X 1. 



A common but poorly preserved form in the Martinez. 



Fig. 4a. Amauropsis martinezensis, n. sp. X 1. 



A form which is common in the middle zone of the Martinez. It 

 appears to be intermediate between A. oviformis of the Chieo and 

 A. alveata of the Tejon. 



Fig. 4b. Amauropsis martinezensis, n. sp. X 1. 



Fig. 5. Lunatia horuii Gabb. X 1. 



Range of this species is Tejon and Martinez. 



Fig. 6a. Lunatia cf. nuciformis Gabb. X 3. 



Fig. 6b. Lunatia ef. nuciformis Gabb. X 3. 



Fig. 7. Xenophora zitteli Weaver, after Weaver. X 1. 



A form which is restricted to the middle or Trochocyathus zitteli 

 and the lowermost or Meretrix dalli zones of the Martinez. 



Fig. 8. Turritella clarlci, n. sp. X 2. 



Fig. 9a. Turritella infragranulata Gabb. X 2. 



The figured specimen is from the Martinez of the Santa Ana 

 Mountains. 



Fig. 9b. Turritella infragranulata. X 2. 



Fig. 10. Turritella martinezensis Gabb. X 1. 



This form was found in Martinez strata near Rock Creek, Los 

 Angeles County, California. 



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