GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



CONTRIBUTIONS TO CANADIAN MICRO-PALAEONTOLOGY.* 



PAET 3. 

 By Prof. T. Rupert Jones, F.R.S., F.G.S. 



5. On some Ostracoda from the Cambro- Silurian, Silurian, and 



Devonia7i rocks. 



INTEODUOTIOR 



Most of the specimens referred to in the present Ecport were col- 

 lected by members of the Staff of the Geological Survey, at the locali- 

 ties and dates mentioned in the text, and were sent to Prof. T. Rupert 

 Jones, F.R.S., for examination and study, in 1890 and 1891. A 

 few, however, are from the private cabinets of W. ll. Billings, T. W. E. 

 Sowter, and Dr. G. J. Hinde. 



In the Quarterly Journal of the Geological Society of London for 

 Xovember, 1890, Prof. Jones published preliminary notes on most of 

 the species represented among the specimens sent to him prior to that 

 date ; but none of the species now reported on have hitherto been 

 adequately described or tigured, and many are now characterized and 

 illustrated for the first time. 



Under the three divisions A, B, and C the genera and species are 

 arranged in an approximately natural order. It was at first in- 

 tended to follow the same plan with the figures in the plates ; 

 uncertainty, however, as to the geological stages of some of the 



♦ Being a continuation of the " Contributions to the Micro-Palivontology of the Cambro- 

 Silurian rocks of Canada,'" It has been found desirable to alter the original title of the present 

 volume and to enlarge its scope so as to include therein reports upon fossils of any ago which 

 require the use of the microscope for their examination. 



