INDEX 



A Page 



Acervularia davidsoni 10, 22, 23, 28, 30, 31, 34, 35, 42, 52, 54, PI. 4 



profundum 41, 53 



rugosa ' 278 



Acidaspis sp 218, 262, PI. 71 



tuberculatus 263 



Acinodesma occidentale 278 



Acinopteria 217, 253, PI. 67 



cf. boydi 131, 152, PI. 36 



cummunis. . . 173, 252 



insignis 217, 252, PI. 67 



textilis 173, 252 



Acknowledgments , x 



Adolphia cf. amarus 6 



Alsopocrinus anna 167, 181, PI. 44 



Alveolites Verneulana 16 



Anastrophia verneuli 167, 190, PI. 47, 48 



Annelida 57 



Anoplia helderbergiae 172 



nucleata 216, 236, PI. 63 



Anoplotheca concava. 173 



dichotoma 217, 251, PI. 66 



flabellites 217, 220, 251, PI. 66 



Anthozoa . . . " 48, 132, 177, 221 



Arbuckle Mts., Section of Helderberg in 169 



Ascodictyon siluriense 171 



Assistants ix 



Athyris bransoni 6 



fultonensis 35, 38, 41, 42, 43, 45, 109, 131, 1^9, PI. 17 



minima 109 



vittata 22, 23, 109, 110, PI. 17 



Atrypa gregeri 41, 97, 98, PI. 18 



hystrix var. occidentalis 99, PI. 23 



nodostriata 173 



reticularis X, 13, 14, 17, 22, 26, 27, 28, 30, 31, 32, 34, 35, 38, 41, 



43, 45, 97, 131, 1^5, 167, 198, 217, 220, 2lf5, PI. 21, 23, 

 50, 65. 



spinosa 41, 45, 98, 131, H5, PI. 20, 23, 34 



Atrypina imbricata 167, 1 97, PI. 50 



Aulopora repens 41, 42, 45, 55, PI. 4 



schohariae : . . 171 



Aviculopecten sp 217, 253, PI. 67 



umbonata 167, 205, PI. 54 



B 



Bailey limestone 1 



age of 166, 167 



Bailey's landing 166 



fossils in ... 166 



Little Saline Creek area 166, 167, 169 



relation to Helderberg 166, 167, 168, 171 



in Ste. Genevieve Co 166, 169 



Beachia amplexa 244 



ovalis 216, 244, PL 65 



suessana 216, 2kU, PI- 64 



Beauvais sandstone 131 



Bellerophon newberryi 278 



pelops 117, 278 



sp 42, 117, 155, PI. 27, 30 



Bibliography 269 



20 



