CAMBRO-SILURIAN FOSSILS OF MANITOBA. 



Trans. R. S. C, li 



Sec. IV. Plate XIV. 



L. M. UAMBE, Oil 



I. — Poterioceras nohile. — Side view of a specimen from East Selkirk. 



2, 3 and 4. — Poterioceras aperium. — (2) Side view of a specimen from Swampy Island ; (3) Similar view of a specimen from Dog's 

 Head ; and (4) Outline of transverse section of another specimen from Dog's Head. AW the figures of natural size. 



