570 INDEX 



Zacanthoides — Continued. page 



eatoni Walcott, listed 317 



spinosus Walcott, associated with Ogygopsis klotzi 378 



compared with Bathyuriscus haydeni 333 



listed 369 



? listed 322 



typicalis Walcott, listed 409 



sp. undt., associated with Bathyuriscus bchis 340 



Zonotrichia, lime secretions 86, 88 



Zonatrichites, algal form described by Bornemann in, 112 



I 



