514 INDEX 



Helcionella — Continued. page 



f f simplex (Walcott), discussed under Gastropoda 59 



{^Stenotkeca simplex), generic references 16 



listed, lower Kiu-lung 64 



stratigraphic and geographic position 46 



Helena, see-Albertella. 



Helena, Montana, Cambrian and pre-Cambrian formations in vicinity of 259 



conclusions of Rothpletz reconnaissance 296 



Weed's study of Cambrian formations 267 



and vicinity, geological map of 262 



see also Mount Helena. 



Helena limestone, described 266 



Belt series 99 



confusion in identification 279 



identified by Rothpletz 260 



identified by Walcott 279 



interpreted b*y Rothpletz 277 



interpreted by Walcott 278 



and Cambrian flathead sandstone, unconformity, fig. 12 286 



and Marsh shale, referred to by Rothpletz 281 



Helena section, Big Belt Mountains 263 



Heliolites, in Beaver Creek section 272 



Helminthoidichnites rneeki Walcott, figured, pi. 21, fig. 7 153 



discussed 98 



? neihartcnsis Walcott, figured, pi. 21, figs. 1-4 152 



discussed 98 



? spiralis Walcott, figured, pi. 21, figs. 5, 6 153 



discussed 98 



sp., listed, Siberian Cambrian 8 



Henrietta, Blair County, Pennsylvania, Middle Cambrian locality loyd 



near 178 



her a, see Sarotogia. 



hermias, see Anomocarella. 



Highgate Springs, Franklin County, Vermont, Middle Cambrian locality 



26 near 182 



Highland Range, Nevada, Lower Cambrian locality 30 205, 209 



Lower Cambrian locality 31a 209 



Hillsdale Postoffice, Algonkian locality 400J, Montana 117 



Himalayan region, connection with North American, Middle Cambrian 



time 13 



Historical review, Cambrian faunas of China 5 



Hoeferia Redlich {^Redlichia Cossmann), generic references 15 



Holm, Gerhard, acknowledgments 312 



quoted 323 



Holmia, compared with Redlichia 60 



Homarus americanus, habitat 84 



Honaker limestone, Upper Cambrian locality 119a 215 



