1916] Dickerson: Tejon Eocene of California 365 



Tellina jollaensis, n. sp 487 



Gastropoda 487 



Architectonica ullreyana, n. sp 487 



Actaeon moodyi, n. sp 488 



Acmaea ruckmani, n. sp 488 



Chrysodomus martini Dickerson 488 



Crepidula inornata, n. sp 489 



Cerithiopsis dumblei, n. sp 489 



Cerithiopsis orovillensis, n. sp 489 



Drillia orovillensis, n. sp 490 



Drillia cooperi, n. sp 491 



Epitonium tejonensis, n. sp 491 



Galeodea sutterensis, n. sp 492 



Ficopsis cooperii Gabb 492 



Fasciolaria bilineata, n. sp 493 



Fusinus merriami, n. sp 493 



Monodonta wattsi, n. sp 494 



Metula harrisi, n. sp 494 



Mitramorpha parsonsi, n. sp 495 



Murex (Ocinebra) nashi, n. sp 495 



Natica gesteri, n. sp 496 



Nyctilochus thunani, n. sp 496 



Nyctiloclius diegoensis, n. sp 497 



Perissolax gabbi, n. sp 497 



Odostomia packi, n. sp 498 



Strepsidura howardi, n. sp 498 



Siphonalia sutterensis Dickerson 498 



Surcula clarki Dickerson 499 



Surcula gesteri, n. sp 499 



Turris stocki, n. sp 499 



Turritella buwaldana, n. sp 500 



Turritella kewi, n. sp 501 



Turritella andersoni, n. sp 501 



Turritella lawsoni, n. sp 502 



Xenophora stocki, n. sp 502 



INTRODUCTION 



Since Conrad first recognized Cardita planicosta, "the finger-post 

 of the Eocene", with thirteen other species in a small boulder sent 

 him by Blake, from the Canada de las Uvas, the question of the 

 occurrence of the Eocene, and later its relations, have from time to 

 time excited interest and, in the time of Gabb, even acute controversy 

 among the Pacific Coast geologists. The occurrence of great thick- 

 nesses of Eocene strata in the region north of Coalinga, Fresno 

 County, California, has recently attracted the attention of various 

 geologists engaged in oil work to the consideration of the divisions of 



