A STUDY OF THE JA^NIES TYPES OF ORDOVICIAN AND 

 SILURIAN BKYOZOA. 



By Ray S. Bassler, 



Assistant Curator, Department of Geology. 



Mr. U. P. Jame.fs was one of the pioneer students of the splendid 

 fauna of the Cincinnati group, and at various times between 1871 and 

 1883 printed the results of his studies in private and other publications. 

 In these papers Mr. James described a considerable number of bryo- 

 zoa as well as of other classes of fossils, but almost invarial)ly failed 

 to illustrate his species. Some of his names were recognized by sub- 

 sequent writers who redescribed and illustrated his species, but the 

 majority are still as left by their author. 



Some years ago the James collection became a part of the paleon- 

 tologic collection of Walker Museum of the University of Chicago, 

 and its types are now accessible for stud3^ The present paper is 

 devoted to a consideration of the bryozoa described b}^ Mr. James, and 

 is based not onl}' upon the James types but also upon numerous authen- 

 tic specimens received from Mr. James and now in the collection of 

 the U. S. National Museum. However, most of these bryozoa (Tre- 

 postomata) he referred to the Tabulate corals, others (Cr3^ptostomata) 

 to the bryozoa, while a few were placed with Stn>t/nitoj}oru and the 

 sponges. It is hoped that the conclusions reached by the present 

 writer in regard to the validit}^ and s^^nonyni}^ of the various species 

 are fair to both Mr. James and subsequent workers along the same 

 line. 



The writer is under obligations to Professors Chaniberlin and Weller 

 for the opportunity of studying this portion of the James collection, 

 and especial thanks are due Professor Weller for his help and advice 

 at various times. 



INTRODUCTION. 



The early systematic work in all branches of natural history is obvi- 

 ously more or less faulty when compared with the standard obtaining 

 to-day, just as many imperfections will no doubt be found by the 

 future student in the results of present researches. This is especially 

 true in regard to paleontologic work, where the student's observations 



Proceedings U.S. National Museum, Vol XXX— No. 1442. 

 Proc. N. M. vol. XXX— 06 1 



