"Longitudinal sections shew that the septa (thirty-five of which can be 

 counted in one specimen) are strongly concave and about seven or eight 

 millimetres apart near the body chamber, but much closer together at the 

 posterior end, also that the siphuncle is almost cylindrical, but slightly 

 contracted at the septa," " and placed at a distance about equal to its 

 own breadth from the margin of the convex (ventral) side.'' 



Little Black Island, Lake Winnipeg, J. B. Tyrrell, 1889 (four specimens), 

 and D. B. Dowling and L. M. Lambe, 1890 (three specimens). Jack 

 Fish Island, Lake Winnipeg, Messrs. Dowling and Lambe, 1890 (one 

 specimen). Commissioners or Cranberry Island (one specimen), and Point 

 off Moose Creek, eight miles southwest of Whiteway Point (one spec'men), 

 D. B. Dowling, 1890. All the specimens from these localities are mere 

 casts of the interior of the shell, but the septa and siphuncle are usually 

 well preserved. 



EoRYSTOMiTES PLiCATUS, Whiteaves. 



Eurystoiiiites plicatus, Whiteaves 1896. Canad. Ree. So., vol. VI., p. 395. 



Plate 22, fig. 2 



Fig. 15. Eurystomites plicatus. Outline of the convex, outer and probably 



ventral side of a specimen from Little Black Island, shevi'ing the 



body chamber and five of the septa. Natural size. 



7 



