820 



CAMBRIAN BRACHIOPODA. 



Ullingsella—Contxrmed. 



reference to, of Otusia sandhergi discussed 770 



reference to, of Syntrophia unxla discussed 805 



reference to, of Wimanella anomala discussed 746 



stratigrapliic position mentioned 31S 



tjTJe species " Orthis coloradoeiisis" 749 



Ulrich on spondylium 308 



vascular markings discussed 311 



? appalach'm, described 750 



compared with Wimanella slielbi/ensis 747, 748 



general geograpluc and stratigrapliic distribution 



tabulated 107 



type specimen figured PI. LXXXVII. fig. 2a 



hivia, described 750 



general geographic and stratigraphic distribution tab- 

 ulated 107 



type specimen figured text fig. 65A, 750 



color adoensis, described 751 



compared with BilliTigsella Tiighlandensis 756, 757 



BilUngsella liTidstromi 757 



Billingsella Tnajor 758 



BilUngsella obscura 758 



Billingsella orientalis 759 



BilUngsella plicatclla 745, 760 



Billingsella pumpellyi 761 



Billingsella retroflexa 761 



EoortUis johannensis 781 



^ Wimunella liarhinensis 745, 746 



Wimanella simplex 748 



deltidium discussed 306 



general geographic and stratigraphic distribution tab- 

 ulated 107 



pedicle opening in 749, 751 



shell section figured textfig.5, 299 



type specimen not figured. 



dice, described 754 



discussed 750 



general geographic and stratigraphic distribution tab- 

 ulated 107 



type specimen figured PI. CI, fig. 8 



exporrecta, described 754 



compared with BilliTigsella exponccta rugosicostata 755 



BilUngsella Mcksi 756 



EooTtUis linnarssoni 783 



Wimanella Mrlanensis 746 



discussed 750 



general geographic and stratigraphic distribution tab- 

 ulated 107 



intermediate between B ilUngsella and Eoorthis 755 



type specimen not figured . 



vascular markings discussed 311 



exporrecta rugosicostata, described 755 



general geographic and stratigraphic distribution tab- 

 ulated 107 



type specimen figured PI. LXXXVIII, fig. 2 



Mclcsi, described 756 



compared with Eoorthis Unnarssoni 783 



general geographic and stratigraphic distribution tab- 

 ulated 107 



type specimen figured PI. XCVII, figs. 7 and 7a 



JiighlandenMs, described 756 



compared ^\'ith Billingsella bivia 750 



Billingsella plicatclla 745 



Wimanella simplex 748 



general geograpliic and stratigrapliic distribution tab- 

 ulated 108 



pseudospondyUum discussed 307 



type specimen figured PI. LXXXVII, fig. 4b 



lindstromi, described 757 



general geographic and stratigraphic distribution tab- 

 ulated 108 



type specimen not figured. 



major, described 758 



compared with Billingsella coloradoensis 752 



general geograpliic and stratigraphic distribution tab- 

 ulated 108 



type specimen figured PI. LXXXVI, fig. la 



marion, described "58 



general geographic and stratigraphic distribution 



tabulated lOS 



type specimen figured text fig. 67A, 758 



Billingsella obscura, described 758 



general geographic and stratigraphic distribution 



tabulated 108 



type specimen figured PI. LXXXVI, fig. 6 



orientalis, described 759 



compared with Eoorthis johannensis 781 



general geographic and stratigraphic distribution 



tabulated 108 



pseudospondyUum discussed 307 



tj'pe specimen figured PI. LXXXVI, fig. 2 



plicatclla, described 759 



compared with Billingsella coloradoensis 745, 752 



Billingsella highlandensis 745 



Billingsella striata 764 



Buenella abnormis 806 



Wimanella harlanensis 745, 746 



general geographic and stratigraphic distribution 



tabulated 108 



intermediate between Billingsella coloradoensis and 



Wimanella harlanensis 745 



shell section figured text fig. 1, 299 



type specimen figured PI. LXXXVI, fig. 3i 



vascular markings discussed 311 



pumpellyi, described 760 



compared with Billingsella retrofiexa 762 



general geographic and stratigraphic distribution 



tabulated 108 



type specimen figured PI. XCVII, fig. 8 



retroflexa, described 761 



general geographic and stratigraphic distribution 



tabulated 108 



type specimen figured PI. XC, fig. Ih 



richthofeni, described 761 



general geographic and stratigraphic distribution 



tabulated 108 



ty^Q specimen figured PI, LXXXIX, fig. 1 



romingcri, described 762 



compared with Billingsella dice 754 



Billingsella pumpellyi 761 



BilUngsella retroflexa 761 



Nisusia ? vaUcirw. 730 



Nisusia (Jamesella) Kuthani 733 



Orthis triccnaria by Ulrich 308 



"Orthis sp. Pompeckj " 793 



Wynnia warthi 771 



general geographic and stratigraphic distribution 



tabulated 108 



t jT)e specimen figured PI. XC, figs. 2, 2a-d 



salemensis, described 763 



compared with Billingsella coloradoensis 752 



BilUngscUa marion 758 



BiUingscUa ichilfieldi 764 



general geographic and stratigraphic distribution 



tabulated 108 



type specimen figured PI. LXXXVII, fig. 3 



striata, described 764 



compared with. Billingsella plicatclla 760 



general geographic and stratigraphic distribution tab- 

 ulated 108 



type specimen figured PI. LXXXVI, fig. 4 



whitfieldi, described 764 



compared with BilUngsella salemensis 763 



general geographic and strarigraphie distribution tab- 

 ulated 108 



type specimen figured PI. LXXXVI, fig. 5a 



Billingsellidee, classification of 321, 325 



compared with Ordo\ician Orthidse 320 



Orthidee, by Ulrich 308 



distribution in Cambrian strata 315, 316 



genera and species referred to , described 725-795 



general stratigraphic distribution and number of Cambrian 



genera and species of 112 



number of Cambrian genera and species of 112 



number of genera and species in monograph 113 



number of OrdoWcian genera and species in monograph 113 



shell structure compared with that of Orthidse 300 



shell structure of 300 



Billingsenidae (Cambrian), shell structure compared with that of 



Ordovician Protremata 300 



