1914] Dickerson: Fauna of the Martinez Eocene of California 85 



Strepsidura pachecoensis, Tritonium pulchrum, and Turritella conica 

 have not as yet been found in a lower horizon. Ficopsis angulatus, 

 Cassidaria tuberculatus, Tritonium impressum, Tritonium_eocenicum, 

 also reported as not present in the lower beds, were really found in 

 beds just above the Martinez, that is, in the basal Tejon. All of these 

 forms come from University of California Locality 337, where they 

 are associated with : 



NummuloidC?), sp. Bela cf. clathrata Gabb 



Orbitoides, sp. Ficopsis remondii Gabb 



Schizaster lecontei Merriam Megistostoma striata Gabb 



Cardium cooperi Gabb Cassidaria tuberculata (Gabb) 



Modiolus merriami (Weaver) Eimella canalifera Gabb 



Psammobia hornii (Gabb) Spiroglyphus ( ?) tejonensis Arnold 



Tellina martinezensis Weaver Turris monolifera Cooper 



Solen parallelus Gabb Tritonium eocenicum Weaver 

 Venericardia planicosta Lamarck 



Of these forms Eimella canalifera, Venericardia planicosta, var. 

 hornii, Bela clathrata, Megistostoma striata, Cassidaria tuberculata, 

 Turris monolifera and Spiroglyphus(f) tejonensis are, as far as the 

 writer knows, typical Tejon forms and they all occur in the basal beds 

 of the Tejon south of Mount Diablo. The others, except the unplaced 

 species described by Weaver, are all found in the Tejon. Ficopsis 

 angulatus Weaver is not a valid species but a variety of F. remondii 

 Gabb, and along with this we must regard the others as Tejon forms 

 from its lower portion. 



Thracia karquinezensis Weaver was found at University of Cali- 

 fornia Locality 532, which is on the same horizon as 537. Its associates 

 were Perissolax, n. sp., and Solen stantoni Weaver. Although Solen 

 stantoni Weaver is not wholly restricted to the uppermost Martinez, 

 it is a characteristic and abundant form of this horizon. One specimen 

 has been found in the basal beds of the Martinez and it also occurs in 

 the Tejon near the base in the Muir syncline. 



Below is given a revised list of the fauna of the upper Martinez, 

 or the Solen stantoni beds. 



EEVISED LIST OF SPECIES OF SOLEN STANTONI ZONE 



Loc. Loc. Loc. Listed by 

 213-501 541 1828 Weaver 



Flabellum remondianum Gabb .... .... x 



Schizaster lecontei Merriam .... .... x 



Cucullaea mathewsonii Gabb x 



Cardium cooperi Gabb x 



Leda gabbi Conrad x 



