48 GEOLOGICAL AND NATURAL HISTORY SURVEY OF CANADA. 



A good specimen of this species was found by Dr. E. Bell, at St. 

 Andrews, Manitoba, in 1880, and its occurrence at this locality has 

 been recorded by Mr. Whiteaves. It adheres to a fragment of white 

 and buff mottled limestone, supposed to be from the same bed that fur- 

 nished Pachydictya magnipora, P. acuta, Fistulipora (?) laxata, and 

 MonticuUpora, Wetherhyi. This bed would, I believe, yield handsome 

 specimens of not only these but of many other bryozoa. 



OSTEACODA. 



The Ostracoda which form the subject of these notes were all, save 

 one species, discovered on slabs of highly fossiliferous limestone, from 

 Stony Mountain, Manitoba, in searching them for remains of bryozoa. 

 They are, unfortunately, not in very good condition, nor are the speci- 

 mens numerous. Indeed, the individuals are unusually few when we 

 consider the number of species represented. 



I am under great obligations to Prof. T. Eupert Jones, of London, 

 England, our greatest authority on fossil ostracoda, for critical notes- 

 on the species. 



Bythocypris cylindrica, Hall. 



PI. IX., fig. 6. 



Leperditia {Isochilina) cylindrica. Hall, 1871. Desc. New Species of Fossils from 



the Hudson River Gr., etc., p- 7. 

 '^ " " Hall. 1872. 24th Kept. State Cab,, p. 230, pi. 



8, fig. 12. 

 Hall and Whitfield. 1875. Pal. Ohio, vol. 2, 

 p 101, pi. 4, fig. 5. 



One badly preserved valve appears to belong to this species. Its 

 dorsal margin seems to have been more convex than usual, that edge 

 being nearly straight in most specimens. As, however, in a few of the 

 Ohio examples referred here, the dorsal line is even a little concave, the 

 degree of curvature must be regarded as variable, unless future research 

 proves that I have united more than one species under this name. 

 Another specimen, having the doi'sal margin lather strongly convex, 

 was collected from near the top of the Hudson Eiver or Cincinnati 

 group, at Savannah, 111. 



Stony Mountain, Manitoba, T. C. Weston, 1884. 



Perfect examples of this species from the lower beds of Cincinnati, 

 Ohio, induce me to refer it to Bythocypris, Brady, since they resemble 

 B. testacella, Jones, and B. concinna, Jones, very closely. One of the 

 valves is a little larger than the other, and its edges overlap those of 

 the smaller. 



