382 



INDEX. 



Page. 



Thamnocella 172 



tolli, Hallopora 333 



Trematopora 178,267 



Tremaiopora 301 



cingulata 306 



nodosa 306 



colliculata 306 



Trematopora cystata 271 



kuckersiana 270 



primigenia 268 



Trematopora pustulifera 306 



Trematopora tuberculosa 268 



Trematopora variabilis 306 



complanata 306 



Trematoporidse 178,267 



Trepostomata 176 



Trilobita, List of 23 



tuberculosa, Trematopora 268 



ulrichi, Protoerisiaa 73 



undulata, Callopora 332 



undulata, Hallopora 332 



undulata, Monotrypa 310 



Ungulite sandstone, A2 10 



Page. 

 Upper Mississippi Valley, Ordovician forma- 

 tions of 25 



uxnormensis, Ceramoporella 82 



varia, Constellaria 219 



Phyllodietya 136 



variabilis complanata, Trematopora 306 



Trematopora 306 



vaupeli, Diamesopora 83 



Vesicular tissue 48 



vetustum, Lioclema 247 



Vincularia megastoma 348 



Vinella 55 



repens 55 



Vinellidae 55 



Wassalem beds, D 3 15 



wesenbergiana, Hallopora 328 



wesenbergiana, Monticulipora 328 



Wesenberg limestone, E 16 



winchelli, Amplexopora 278 



wincbelli, Batostoma 278 



spinulosum, Batostoma 279 



Zoarium 46 



Zooecium 46 



o 



