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
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