INDEX. 



859 



OrtMs "hiforta," compared with Syntrophia harahuensis 799 



callactis, type of Orthis (restricted) 772 



callactis-tricenaria group, compared with average Cambrian 



articulate hy Ulrich 308 



calligramma, mentioned 772 



"christianise,'" forms referred to, diSerentiated 775 



Brogger, discussed 776 



Gagel, discussed 776 



Roemer, discussed 776 



"coloradoensis," type of Billingsella 749 



"exporrecta," compared with Eoorihis Ummrssoni 783 



discussed 755 



fissicosta, mentioned 772 



flabellites, compared with Plectorthis whitfteldi hy Ulrich 308 



"hicksi,' ' compared with Eoorihis linnarssoni 783 



discussed 755 



"m/^exa," compared with iVisMsia? vaticina 730 



jamesi, mentioned 772 



"kuthani," compared with Nisusia {Jamesella) perpasta 736 



"lenticularis," mentioned 731 



"lenticularis? Kayser," discussed 767-768 



"lynx," compared with Eoorihis primordialis 785 



mcnapise, compared with Eoorihis saltensis 788 



"parva Dalman," discussed 776 



' 'pepina,' ' compared with Clitambonites 739 



discussed 749 



"pUcatella," type of Plectorthis Hall and Clarke 772 



"primordialis," association mentioned 735 



"remnicha," type of Eoorihis 773 



''romin^eri," compared with iVzswsfa f vaticina 730 



compared with Nisusia (Jamesella) kuthani 733 



"Orthis sp. Pompeckj " , 793 



"saltensis," compared with Orusia lenticulaTis 768 



mentioned 499, 767 



"sandbergi," type of Otusia , 769 



sinuata, mentioned 772, 785 



"sirmiwZa," compared with Nisusiaf vaticina. _ 730 



mentioned 785 



subquadrata, mentioned 772 



tricenaria, American representative of Orthis callactis 772 



compared with Billingsella romingeri by Ulrich 308 



Dalmanella subsequata by Uhich 308 



muscle scars of, discussed by Ulrich 308 



See also Orthis callactis-tricenaria group. 



tripUcatella, mentioned 772 



tritonia, muscle scars of, discussed by Ulrich 308 



" vaticina Salter MS.," discussed 730,731 



"sp. Kayser," discussed 767, 768 



discussed and compared with Orusia lenticularis 789 



sp. Pompeckj, discussed 775,793 



*^Orihis {^Orthis christianise) Roemer," discussed 776 



Orthis (Billingsella) laurentina, compared with Plectorthis whit- 



ficldi by Ulrich 308 



Orthis (Dalmanella) parva, compared with Eoorthis 773 



"Orthis ( Firikclnburgia) finkelnburgi," type of Finkelnhurgia 794 



" Orthis (Plectorthis)," discussed 772 



reference to, of Billingsella retroflexa discussed 761 



reference to, of Otusia sandbergi discussed 770 



Orthisina, compared with Kutorgina 579 



Protorthis 739 



reference to, of Eoorthis johannensis discussed 781 



reference to, of iVwusia? vaticina discussed 730 



reference to, of Nisusia (Jamesella) pellico discussed . . 735 



"adscendens," compared with Nisusia (Jamesella) pellico . . 735 



"festinata," type of Nisusia 725 



"orientalis," compared with Eoorthis johannensis 781 



" pepina," compared with Eoorthis johannensis 781 



Orthoceras limestone, in generalized section for Sweden, Denmark, 



Finland, and Norway, listing species and localities 144 



systemic reference discussed 98 



Orthoceratite limestone (Passage beds), equivalent to the Vagi- 



noceras limestone 628 



in generalized section for Russia, listing species and locali- 

 ties 143 



localities in 336d-f, 336z, 337, 337a-c, 337f-li, 337j-m, 390 



Orthoids, canal system mentioned 312 



Orthostrophia, classification of, by Ulrich 308 



no Cambrian representatives 320 



Orthothetes compared with Eostrophomena 796 



Orthotichia, classification of, by Ulrich 308 



Orusia, described 765 



cardinal area discussed 305 



classification of 321 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 108 



general stratigraphic distribution and niamber of Cam- 

 brian species and varieties of Ill 



muscle scars discussed 313 



number of species of, in different types of sediment 160 



stratigraphic position mentioned 320 



type species "Anomites lenticularis" 765 



Ulrich on spondylimn 308 



vascular markings discussed 312 



? eurekensis, described 765 ' 



general geographic and stratigraphic distribution tab- 

 ulated 108 



type specimen figured PI. CI, fig. 7 



lenticularis, described 765 



compared with Orthis sp. Kayser 789 



Orusia? eurekensis '. 765 



general geographic and stratigraphic distribution tab- 

 ulated 108 



type specimen not figured. 



lenticularis atrypoides, described 769 



discussed :. 768 



general geographic and stratigraphic distribution tab- 

 ulated 108 



type specimen figiired PI. XCVIII, fig. 5 



lenticularis hjncioides, described 769 



discussed 768 



general geographic and stratigraphic distribution tab- 

 ulated , , 108 



type specimen figured PI. XCVIII, fig. 4 



lenticularis strophomenoides, discussed 768 



Osceola, Nevada, localities near 8m, 8n, lOw 



Osceola, Wisconsin, localities near 78, 78b, 78c, 78s, 328b, 328iu, 328n 



osceola, see Finkelnhurgia and Lingulella mosia. 

 osceola corrugata, see Finkelnhurgia. 



Oslo, near Christiania, Norway, locality at 323m, 



Osthammar, Sweden, localities near 311a, 311p 



See also Fanton Island. 



Ostra Ryiminge, Sweden, locality at -320u 



Otisville, Minnesota, locality at 339a 



Ottawa River, Quebec, locality on 392h 



Ottenby, Oeland Island, Sweden, localities at 310, 310r, 390e 



Otusia, described 769 



cardinal area discussed 305 



classification of 321, 325 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 108 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of m 



number of species of, in different types of sediment 160 



reference to, of Otusia sandbergi discussed 770 



stratigraphic position mentioned 320 



type species " Orthis sandbergi" 769 



Ulrich on spondylium 30S 



sandbergi, described 769 



compared with Finkelnburgia finkelnburgi 794 



Otusia utahensis 770 



general geographic and stratigraphic distribution 



tabulated 108 



type specimen not figured. 



utahensis, described ■ 770 



general geographic and stratigraphic distribution 



tabulated 108 



type specimen figured PI. LXXXIX, fig. 3 



Ouray County, Colorado, localities in 335a, 360b 



Outside lateral muscle scars, shown in figure 374 



Outside and middle lateral (protractor) muscles, defined 294 



ovalis, see Acrotreta. 



vando quadrangle, Montana, localities in 4q, 4q', 4v, 4w, 8j 



Oviedo, Spain, locality in 350a 



Owen, D. D., bibliographic references 22 



species named for 523 



weni, see Lingulella. 



