CONTENTS AND ILLUSTRATIONS. 5 



Part II. SvN'OPsis and Descriptions of Si'bgexera and Species — Continued. 

 Descriptions of subjienera and species — Continued. 



Genus Pecten Midler — Continued. Paprc- 



Subgenus Chlair ys Bolten 49 



Subgenus Lj-r, pecten Conrad 49 



Subgenus ^quipecten Fischer 49 



Subgenus Plagioctenium Dall hO 



Subgenus Pseudamusinm H. and A. Adams .">0 



Subgenus Amusiuin Bolten _ .^0 



Subgenus Propeannisiuni Oregorio .iO 



Subgenus Hinnites Defrance nO 



Eocene Pectens .51 



Oligocene Pectens .")4 



Miocene Pectens .59 



Pliocene Pectens 94 



Pleistocene Pectens 127 



Recent Pectens 1 .^4 



Unidentifiable Pectens 141 



Bibliography - 142 



Plates 147 



Index :?51 



Plate I. Sketch map of California, showing the princijial fo.ssiliferous Tertiarj- localities 7 



II. Pecten calkinsi n. sp., P. landesi n. sp., P. proavus n. sp., and P. interradiatus 



Gabb 149 



III. Pecten clallamen.sis n. sp., P. waylandi n. sp., P. jieckhami Gabb, P. branneri 



n. sp., and P. sanctu'cruzensis n. sp 1,51 



IV. Pecten carrizoensis n. sp. and P. coalingaensis n. sp l 153 



V. Pecten keep! n. sp., P. dilleri Dall, and P. sespeensis var. hydei n. var 155 



VI. Pecten keepi n. sp. and P. coosensis Shumard , 157 



VII. Pecten propatulus Conrad and P. coosensis .Shumard 1.59 



VIII. Pecten oweni n. sp. and P. sespeensis n. sp UU 



IX. Pecten propatulus Conrad 163 



X. Pecten fncanus Dal! and P. wattsi var. morani n. var 165 



XI. Pecten wattsi n. sp., P. hainlini n. sp., P. nutteri n. sp., and P. cra?sicardo 



Conrad var. hamiltoni n. var 167 



XII. Pecten bowersi n. sp 169 



XIII. Pecten bowersi n. sp 171 



XIV. Pecten perrini n. sp 173 



XV. Pecten perrini n. sp. and P. neahensis n. sp 175 



XVI. Pecten crassicardo Conrad 177 



XVII. Pecten crassicardo Conrad 179- 



XVIII. Pecten cra.ssicardo Conrad IHl 



XIX. Pecten estrellanus Conrad 1 83 



XX. Pecten e.strellanns Conrad and P. estrellanus Conrad var. catalinip n. var 185 



XXI. Pecten estrellanus Conrad 187 



X XII. Pecten niiguelensis n. sp 189 



XXIII. Pecten niiguelensis n. sp., P. estrellanus Conrad var. terminus n. var., P. vaughani 



n. sp., P. stanforden.sis n. sp., and P. lompicoensis n. sp 191 



XXIV. Pecten magnolia Conrad 193 



XXV. Pecten magnolia Conrad, P. cerrosensis Gabb var. mcmlenlialli n. var., and P. 



eldridgei n. sp 1 9.5 



