INDEX. 



813 



A crothele panderi, described 651 



general geographic and stratigraphic distribution tabu- 

 lated 105 



in group based on surface characteristics 632 



type specimen figured PI. LIX, fig. 5 



pretiosa, described 652 



general geographic and stratigraphic distribution 



■ tabulated 105 



in group based on surface characteristics 632 



stratigraphic position of beds containing, discussed . . . 705 

 type specimen not figured. 



prima, described 653 



compared with Acrothele avia 636 



AcTothcIe bohemica 639 



A cTothcle prima coHata 653 



A crotkelc proles 655 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 632 



surface discussed 633 



type specimen figured PL LXI, fig. 6 



prima costata, described 653 



compared with ^1 crotheh artemis 634 



Acrothefe bohemica 639 



A crothele mattheioi muUicostata 650 



A crotheh prima 652 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 632 



surface ornamentation discussed 302, 633 



type specimen not figured. 



primxva, described 654 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 633 



type specimen figured PI. LVII, fig. 6 



proles, described 654 



compared with. Acrothele avia .* 636 



A crothele matthewi 64S 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 632 



type specimen figured PI. LXII, fig. 4 



quadrilineata, described 655 



compared with Acrothele bergeroni 638 



Acrothele coriacea 643 



Acrothele primseva 654 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 632 



type specimen figured PI. LVII, fig. 5 



rara, described 655 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 633 



type specimen figured PI. LXIII, fig. 4 



spurri, described 656 



compared with A crothele subsidua 658 



Acrothele subsidua hera ■ 659 



A crothele turneri 660 



A crothele woodworthi 661 



general geographic and stratigraphic distribution 



tabulated 105 



in group based on surface characteristics 632 



type specimen figured PI. LX, fig. 3 



subsidua, described 656 



compared with Acrothele dichotoma 645 



A croth cle maculata 647 



A crothele rara 655 



Acrothele spurri : 656 



Acrothele subsidua hera 659 



Acrothele subsidua laevis 659 



Acrothele turneri 660 



Acrotreta idahoensis 633 



Acrotreta sagittalis taconica 633 



■ general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 632 



surface ornamentation discussed 302 



type specimen figured PI. LX, fig. 1 



Acrothele subsidua hera, described 659 



general geographic and stratigraphic distriliution tab- 

 ulated 105 



in group based on surface characteristics 632 



tjTje specimen figured PI. LX, fig. 9 



subsidua Isevis, described 659 



compared with A crothele subsidua 658 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 632 



type specimen not figured. 



turneri, described. : 660 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 632 



type specimen figured PI. LX, fig. 7 



villaboimensis, described 660 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 633 



type specimen not figured. 



woodworthi, described '. 661 



compared with A crothele spurri 656 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 632 



stratigraphic position mentioned 318 



type specimen figured Pi. LX, fig. 6 



yorkensis, described 661 



compared with Acrothele sp. undt. a 662 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 632 



type specimen figured PI. LIX, fig. 4 



sp. undt. a, described 662 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 633 



type specimen figured PI. LXIII, fig. 5 



sp. undt. Moberg, described 662 



general geographic and stratigraphic distribution tab- 

 ulated 105 



in group based on surface characteristics 633 



Acrothele (RedHchella) , described 662 



cardinal area discussed 305 



classification of. 321, 324 



evolution of 317 



general geographic and stratigraphic distribution of the 



species referred to 105 



general stratigraphic distribution and number of 



Cambrian species and varieties of m 



intermediate between Botsfordia and Acrothele 663 



number of species of, in different t3T)es of sediment. . . 160 



type species ^'Acrothele granulata" 632,663 



granulata, described 663 



compared with Acrothele bellapunctata 637 



Acrothele bohemica 639 



A crothele coriacea 643 



Acrothele intermedia 646 



Acrothele matthewi 632, 648 



Acrothele panderi 651 



Acrothele rara 655 



Acrothele subsidua 658 



A crothele yorkensis 662 



Botsfordia granulata 602 



general geographic and stratigraphic distribution 



tabulated 105 



intermediate between Acrothele coriacea and Botsfordia 



granulata 663 



surface of, confused with that of Acrotreta socialis 712 



surface ornamentation discussed 302 



type specimen not figured. 



Acrothelina;, classification of 321, 324 



genera and species referred to, described 630-665 



A crothyra, described .- 715 



cardinal area discussed 305 



classification of. 321, 324 



compared with A crothele and Acrotreta 313 



Acrotreta? cancellata 679 



Disdnopsis 721 



