GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



CONTRIBUTIONS TO THE MICRO-PALEONTOLOGY OF THE 

 CAMBRO-SILURIAN ROCKS OF CANADA. 



PART 2. 



By E. O. Ulrich. 



4. — On some Polyzoa {Bryozod) and Ostracoda from the Gamhro- Silurian 



rocks of Manitoba, 



IKTEODUOTlOlSr. 



The following repoi t on some fossil Polyzoa* (Bryozoa) and Ostracoda 

 from Manitoba is based upon a small collection of specimens which had 

 been made at various times between the years 1875-84, both inclusive, 

 by different members of the Survey, but mostly by Mr. T. C . Weston. 

 This material, together with thirty-five microscopic sections of most of 

 the species represented, prepared by Mr. Weston, which were an 

 important aid to me in their study, was sent to me in February, 1887, 

 for examination, by Mr. J. F. Whiteaves, the palseontologist to the 

 Survey.f 



The fossils wer*^ studied, the drawings made and the two plates 

 printed in 1888, but, in consequence of adverse circumstances entirely 

 beyond my control, the descriptions could not be written out until 

 quite recently. 



The terminology employed in describing the Polyzoa (Bryozoa) is the 

 same as that adopted in my report on the Illinois Bryozoa, in the forth- 

 coming volume (YIII.) of the Illinois Geological Survey Reports. 



E. O. ULRICH. 



IsTewport, Kentucky, April 3rd, 1889. 



*In conformity with long usage in the Survey Reports and with that of most British writers, 

 the term Polyzoa (Thompson) is here adopted rather than Bryozoa (Ehrenberg) though Mr. 

 Ulrich, in commonwiththemajority of European and U.S. naturalists, prefers the latter. — J.F.W- 



t The Ostracoda sent had not been critically examined in Ottawa, but among the Polyzoa 

 three species, viz., Bythopora delicatula, Monotrypella quadrata, and PhyllopoHna Trentonensin , 

 had been recognized, as well as Solenopora compacta, whose systematic position is still doubtful, 

 though t is placed by Zittel among the Bryozoa).— J.F.W. 

 November, 1889. 



