446 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 

 Clark, William B., species named after 80 



Clarke, John M., acknowledgments 235 



genus named after iii 



Clarke, John M., and Ruedemann, R., bibliographic reference 372 



Clarkella, new genus, described and discussed no 



classification of 142, 148 



compared with Syntrophia, Hucnella, and Polytcechia iii 



evolution of pi. 11 (pp. 140-141) 



clarki, see Dcarbornia. 



Classification of the Brachiopoda 141-148 



claytoni, see Acrotreta and Olcncllus. 



Cleveland, Tennessee, fossils from 310, 340 



Cobbold, E. S., bibliographic reference 372 



Cole, G. A. J., bibliographic reference 372 



collcni, see Acrothele. 



coloradoensis, see BiUingsella and Eoorthis. 



Columbiana, see PhiUiedra. 



Comley quart}', fossils from 282, 283 



Comley sandstone, fossils from 282, 283 



communis, see Hyolithcs. 



Conception Bay, fossils from e8o 



Conocephalus cf. persens, stratigraphic position and association 211 



Conocoryphidse, compared with Burlingidae 15 



Conrad, T. A., bibliographic references iii, 161, 218 



contracta, see Vanuxemella. 



Cordillera, see Ptychoparia. 



Cordilleran land area in Cambrian time 168, 169 



Cordilleran sections compared with those in China 172 



coriacea, see Acrothele. 



Corral Creek formation, photo of near Fort Mountain pi. 46, fig. 2 



section of 428, 429 



Corral Creek-Hector series, correlated with Camp Creek and Kintla- 

 Sheppard series 431 



corrugata, see Orthotheca. 



Corynexochus romingeri, stratigraphic position and association 211 



costata, see Acrothela prima. 



Craniacea, classification of 142 



defined 147 



Cranidium, defined 14 



Craniidae, classification of 142 



defined 147 



diagram showing line of descent 140 



distribution in Cambrian strata 140 



crassimarginatus, see Olenellus thompsoni. 



crenistria, see Micromiira {Paterind). 



Crepicephalus augusta, stratigraphic position and association 184 



liliana, stratigraphic position and association 184 



texanus, stratigraphic position and association 177, 178 



sp. undt., stratigraphic position and association. ..175, 176, 204, 205, 213 



