SYSTEMATIC PALEONTOLOGY 

 LOWER DEVONIAN 



COELENTERATA C. K. Swartz. 



ECHINODERMATA. 



CYSTOIDEA Charles Schuchert. 



CRINOIDEA D. W. Ohern. 



VERMES D. W. Ohern. 



MOLLUSCOIDEA. 



BRYOZOA E. 0. Ulrich and R. S. Bassler. 



BRACHIOPODA Charles Schuchert and T. P. Maynard. 



MOLLUSC A. 



PELECYPODA D. W. Ohern and T. P. Maynard. 



GASTROPODA D. W. Ohern and T. P. Maynard. 



CEPHALOPODA D. W. Ohern and T. P. Maynard. 



ARTHROPODA. 



TRILOBITA D. W. Ohern and T. P. Maynard. 



OSTRACODA E. 0. Ulrich and R. S. Bassler. 



