76 "WHITEAVES ON FOSSILS FEOM THE 



The foregoing description is intended to apply only to those specimens in which the 

 greater part of the test is preserved. The condition in which the species is iisually 

 obtained is that of mere casts of the interior of the shell. In these, the slender early whorls 

 are often broken off, the suture, on the flat side, is deeply excavated or channeled, and, 

 on the convex side, a large portion of the inner whorls is visible in the umbilicus. The 

 whole of the thick test between the volutions is sometimes naturally removed in these 

 casts, in which case the volutions are completely separated. 



In Appendix 1 to the Narrative of Franklin's Second Expedition to the Shores of the 

 Polar Sea, under the heading " Limestones of Lake "Winnipeg," the discovery, among 

 other fossils, of specimens of a Maclurea which is most probably identical witli the 

 present species, on the western shore of that lake, in 1825, is thus referred to by Sir John 

 Eichardson : — " Professor Jameson enumerates terebratulse, orthoceratites, encriuites, cary- 

 ophyllitte and lingulae, as the organic remains in the specimens brought home by Captain 

 Franklin on his iirst expedition. Mr. Stokes and Mr. James De Carle Sowerby have 

 examined those which we procured on the last expedition, and found amongst them 

 terebratulites, spirifers, maclurites and corallines. The maclurites belonging to the same 

 species with specimens from Lakes Erie and Huron, and also from Igloolik, are perhaps 

 referable to the Maclurea magna of Le Sueur." 



A few casts of the interior of shells which are certainly referable to JSI. Manilobensis 

 were collected by Mr. John Fleming in 1858 at Limestone Point, Lake "Winnipeg, eleven 

 miles north of the Little Saskatchewan, and by Prof H. Youle Hind, in the same year, at 

 Deer Island, near Grindstone Point and at Punk Island, on the same lake. These 

 specimens, which are still in the Museum of the Survey, are referred to by Mr. E. Billings, 

 in chapter 20 of Prof Hind's report, as belonging to a siaecies of Maclurea, " allied to M. 

 Logani, Salter, but with more slender whorls." 



Since then the species has been collected at the following localities, but the first 

 specimens known to the writer in which any considerable portion of the test is preserved 

 were obtained in 1884, by Mr. T. C. "Weston at Pike Head and Kinwow Bay, Lake 

 "Winnipeg, and by Mr. McCharles at East Selkirk. Between Fort Alexander and the 

 mouth of the Red River, Dr. R. Bell, 1874. At the second and third rapids of the Nelson 

 River, Keewatin, Dr. R. Bell, 18*79. Elk Island, Big Island, Grindstone Point, "Washow 

 Bay, Bull Head Bay, Dog's Head, Pike Head or Jackfish Bay, and Kinwow Bay, all in or 

 on Lake "Winnipeg; T. C. "Weston, 1884. East Selkirk, Manitoba, T. C. "Weston and A. 

 McCharles, 1884. North end of Big Island, Big Grindstone Point and Swampy Island, 

 Lake "Winnipeg, J. B. Tyrrell, 1889. 



In the writer's judgment, M. Manilobensis is much more nearly allied to the M. 

 Bio-sbyi of Hall (from the lower part of the Butf limestones of the Trenton group at 

 various localities in southern "Wisconsin) and to the M. cuneata of "Whitfield (from the 

 upper portion of the Trenton group, or Galena limestone of "Wisconsin and Iowa) than it 

 is to either M. magna or M. Logani. Still, the oblique flattening of the convex side of 

 the outer volution in the present species and its distinctly angulated periphery would 

 seem to separate it sufficiently from M. Bigsbyi, while its comparatively broad uiubilicus 

 and more slender volutions wovild apparently prevent its reference to M. cuneula. The 

 surface of the shell of M. Bigsbiji, too, as seen in the matrix, is described as being marked 

 only with " strong revolving striae." 



