Index 



Planorbis, 445. 



Plectosolen curtus, 155. 

 Pleurotoma perissolazoides, 190. 



Pliauchenia (?) 512, 532; figures of, 



515, 516, 579, 580, 581. 

 Pliohippus, sp. 451, 452, 548, 549, 564, 

 573; milk dentition, 567; figures 

 of, 569, 570, 572. 

 Pliohippus, sp. a, near mirabilis, 567; 

 figures of, 567. 

 coalingensis, 507, 565, 567. 

 fairbanksi, 506, 564; figures of, 565, 



566, 568. 

 interpolatus, 565. 

 mirabilis, 506, 561. 

 pernix, 570. 

 supremus, 561, 567. 

 tantalus, 506, 507, 561-567; figures 

 of, 562, 563, 566. 

 Pliohippus? or Protohippus? sp., 505- 

 507, 526; figures of, 506, 555; 

 measurements, 507. 

 Polyehaeta, 192. 



Polyniees (Neverita) reeluziana, 167. 

 Potomides, genus, 171. 



(Cerithidea) branneri, 171; plate 



showing, opp. 230. 

 Priscofusus hecoxi, 178. 

 Proboscidea, 471, 548. 

 Procamelus (?) 512, 514, 552; figures 



of, 513, 514, 515, 516, 579, 580, 



581. 



leptocolon, 516. 

 Pronomotherium, 575. 



altiramum, 577, 578. 



laticeps, 578. 

 Prosthennops? sp., astragalus, figure 

 of, 507. 



Protohippus, sp., 451, 570, 575. 

 Protohippus? or Pliohippus? sp., 505- 



507, 532, 561; figures of, 506; 



measurements, 507. 

 Psammobia, genus, 155. 

 edentula, 155. 



aff. edentula, 155; plate showing, 

 opp. 218. 

 Psammobiidae, 155. 

 Pseudaelurus, sp., 469; measurements, 

 469; figure of, 471. 

 interpidus, 469; measurements, 469. 

 Pseudoperissolax, genus, 181. 

 blakei, 181. 



merriami, 181; plates showing, opp. 

 228, 230. 

 Pseudoperissolax? sp. indt., 182. 

 Pyramidellidae, 163. 

 Quaternary formation, areal map of, 



opp. 78. 

 Eaben, E., cited, 381. 



Eadiolarian cherts, petrographic fea- 

 tures of, 253-264; red cherts, 254; 

 shaly cherts, 257; veining, 259; 

 leaching, 260; chemical weather- 

 ing, 261; gray and green cherts, 

 261; black and white cherts, 262; 

 massive white cherts, 263; matrix, 

 263; concretions, 263; shale part- 

 ings, 264-270; mammilated, 273; 

 indigo, 276. 



Radiolarian Cherts of the Franciscan 

 Group, 235-432. See also Cherts, 

 radiolarian. 



Eadiolarian rocks, earths, mudstones, 

 occurrences of, 304, 333; in Ire- 

 land, 324. 



Banella mathewsonii, 173. 

 Eansome, F. L., cited, 17, 27, 244, 245, 

 350, 404. 



Eecent mammals from Mohave Desert, 

 list, 439. 



Red Rock Canon. See Eicardo for- 

 mation. 



Republican River fauna, 532. 

 Rhinoceros, 451. 



Rhythmic bedding of radiolarian 

 cherts, hypotheses as to origin of, 

 386-402. 



Eicardo fauna, 525-585; environment, 

 525; relationships, 526, 556; list 

 of, 525; climatic conditions, 526; 

 comparative table of, 527; com- 

 parisons with Barstow fauna, 

 528-529; with faunas of Pacific 

 Coast province, 530; with other 

 American faunas, 531-532; de- 

 scriptions of, 533-585. 



Eicardo Eed Eock Canon formation, 

 443, 447, 448, 449, 452. 



Rodent fauna, Mohave area, 439, 440. 



Rodentia, 471, 547. 



Rosamond series, 440, 441, 442, 446. 



Eostellaria indurata, 185. 



Rothpletz, A., cited, 354, 384. 



Samos, island of, hipparion from, 558. 



San Emigdio Hills, California, 100. 



San Lorenzo series, 45-57 passim; 

 stratigraphic breaks in, 76, 79, 

 109; fauna of, 81, 83, 86, 88, 89, 

 95, 98; beds of, in Napa County, 

 California, 99; description of 

 species, 119-194. 



San Lorenzo Series of Middle Cali- 

 fornia, 45-234. 



San Luis formation, 4. 



San Pablo formation, areal map of, 

 opp. 78. 



San Eamon formation, 74, 78, 80; areal 

 maps of, opp. 74, 78. 



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