INDEX 421 



Aptis, Bernard's study of 162 



compared with Marrella splendcns 192 



parapodia of 162 



posterior segments of 159 



separated from Burgessia 162-163 



mentioned 191 



Archean complex, discussed 4 



Archi-Annelida, possibility of finding Ill 



Arenicolites woodi Whitfield, listed from Jordan formation 355 



Arethusina ? americaiia Walcott, listed from locality 62 361 



listed from locality 66 362 



Arionellus, a synonym for Agraulos (footnote) 80 



ajax Walcott {^=Lisania ajax (Walcott)), former and present ge- 

 neric reference 70 



alala Walcott (^Lisania alala (Walcott)), former and present 



generic reference 70 



bipunctatiis Shumard ?, referred to Conaspis (footnote) 358 



Arizona sea, discussed 3 



annata, see Leperditia. 



armatiis, see Agraulos, Bathyurus, and Inouyia. 



Asaphelina, included by Beecher under Dikelocephalinae 347 



miqueli, referred by Bergeron to the Asaphidse 347 



Asaphidae, mentioned 196 



Asaphiscus iddingsi Walcott, new species described 99 



figured, pi. 16, fig. 3 106 



compared with Asaphiscus wheeleri Meek loi 



dimensions 100 



listed, Cambrian faunas of China y:i 



Asaphiscus wheeleri Meek, compared with Asaphiscus iddingsi loi 



Asaphus, Dikelocephalus first referred to, by Owen 365 



mentioned under stratigraphic section zi^ 



cariboitcnsis Walcott, listed from locality 201a 359 



platyccphalus, mentioned 190 



asiaticus, see Bathyiiriscus. 



Asterocheridse, hepatic caeca of 160 



atava, see Lingulella. 



Atlantic coast region, Algonkian rocks of, terrigenous origin of 3 



atlantica, see Obolella. 



Auricularia, simplest larval form of Holothurioidea 44 



aurifera, see Palmyra. 



aurora, see Obolus (Westonia). 



auroralis, see Triarthrella. 



Ausable Chasm, New York, Upper Cambrian locality 77 262-304 



Aylmer sandstone, Chazy apparent association with Hoyt limestone 253 



species, named 253 



Ayshea Peak, generic name derived from 117 



Aysheaia Walcott, new genus described 116 



genotype, Aysheaia pedunculata 1 16 



geographic distribution 117 



stratigraphic range 117 



