442 INDEX 



Eldonia — Continued. page 



ludwigi Walcott, new species descriljed 46 



figured, pi. 8, fig. 3 58 



pi. 9, figs. 1-5 60 



pi. 10, figs. 1-3 62 



pi. 1 1, figs. 1-3 64 



pi. 12, figs. 1-3 66 



text fig. 5 47 



alimentary canal described 48 



associated with Pcytoia nathorsti 57 



compared with Pclagofhiiria natatrix 50 



dimensions given 49 



formation and locality 51 



genital organs discussed 49 



genotype of genus Eldonia 46 



muscles, discussed 46 



occurrence 50 



observations 50 



pelagic form of Holothurioidea 43, 44 



radial canals, described 47 



stratigraphic position and association 152, 153 



trilobites, crustaceans and sponges associated with 50 



Eldoniidas Walcott, new family named 45 



Eleventh International Geological Congress, Sweden (footnote) i 



EUipsocephalus hoffi Barrande, compared with Inoiiyia 81 



Elliptocephalus ? curtus (Whitfield), listed from Franconia formation... 357 

 clongatits, see Illccnuriis. 



Emerald mountain, lake, and glacier, British Columbia, Canada 203 



Emeraldella Walcott, new genus discussed 203 



between Branchiopoda and Merostomata 163 



characterized 158 



classification of 155 



labrum of 158 



referred to Aglaspidfe ^ 203 



representing Merostomata 155 



brocki Walcott, new species described 203 



figured, pi. 30, fig. 2 220 



text fig. 8 204 



appendages of 203 



compared with Bidentia difUcilis 174 



compared with Emeraldella micrura 205 



compared with Opabinia regalis 203-204 



related to Molaria spinifera 201 



stratigraphic position and association 153 



micrura Walcott, new species described 205 



figured, text fig. 9 205 



compared with Emeraldella brocki 205 



Eminence formation. Lower Ordovician localities, Missouri 390 



Ozark section, Missouri, compared with " Kittatinny " lime- 

 stone 256 



