164 PROCEEDINGS OF THE PALEOXTOLOGICAL SOCIETY 



On Saturday, April T, at 10 Ad, tli€ meeting was called to order by Dr. 

 C. E. Weaver. The follo^dng papers were presented: 



CRETACEOUS AND TERTIARY STRATIGRAPHY OF THE ^VESTERX END OF THE 

 SANTA INEZ MOUNTAINS, SANTA BARBARA COUNTY, CALIFORNIA 



BY H. J. HA.WLEY 



{Abstract) 



The western end of the Santa Inez Mountains is made up wholly of sedi- 

 mentaries of Cretaceous and Tertiary age. The Cretaceous is represented by 

 Chico sandstones, overlain unconformably by Tertiary sediments. The Tejon 

 is the local representative of the Eocene period, and the fauna of this series 

 shows a remarkable similarity to the fauna from the type Tejon. Lower Mio- 

 cene, which may be divided into Yaqueros and ^Monterey, represents the latest 

 period of deposition in this regino. 



GEOLOGIC RANGE AND EVOLUTION OF THE MORE IMPORTANT PACIFIC 



COAST ECHINOIDS 



BY W. S. W. KEW 



(Ahstnict) 



Geologic ranges of the more important echinoid genera of the Pacific coast 

 are as follows: CuUiris, Eocene, with exception of one species in the Oligo- 

 cene; Strongylocentrotus, Pliocene to Recent; Scntelht, Upper Eocene to Plio- 

 cene, with greatest development in the Lower Miocene; Dendraster, dominant 

 in the Pliocene and continuing to the Recent: Astrodapsis. confined to the 

 Upper Miocene and Lower Pliocene. 



Scutella, Astrodapsis, and Dendraster serve best to illustrate the lines of 

 descent of echinoids on the Pacific coast. Scutella evolves along two main 

 lines, that of the ^'. coosensis-^. norrisi group and that of the S. merriami- 

 8. Jilancoensis group. Astrodapsis, derived from the ^cutellas, acquires the 

 characters of elevated petals and grooved interambulactral areas, which be- 

 come more pronounced until the specialized A. major and A. arnoldi stages are 

 reached. Following these stages the genus suddenly becomes extinct. Den- 

 draster, also originating from the Scutellas. passes from the D. gibhsi type, 

 with more or less thickened test and eccentric apical system, to the thin test 

 and extreme apical eccentricity of D.aslilej/i (Arnold), and finally to the 

 recent D. excentricus (Eschscholtz). with a less eccentric apical system. 



EVIDENCE IN SAN GORGON 10 PASS. RIVERSIDE COUNTY, OF A LATE 

 PLIOCENE EXTENSION OF THE GULF OF LOWER CALIFORNIA 



BY F. E. VAUGHAN 



{Abstract) 



A small invertebrate fauna was collected in San Gorgonio Pass, 8 miles 

 east of Millard Canyon. Several forms from this locality are the same as 



