213 



" Shell very nearly cylindrical, but increasing in thickness at the rate 

 of about one millimetre in two inches, and slightly compressed, the out- 

 line of its transverse section being rounded elliptical, with the larger 

 diameter about one-fourth larger than the smaller. Surface marked with 

 narrow but very prominent distant annulations, or transverse raised 

 ridges, separated by flat intervals, which are about half as broad as the 

 maximum diameter of the tube, and transversely costulate where the test 

 is well preserved. Septa remote, each of the larger annulations of the 

 test marking the commencement of a new septum, and shallowly concave 

 internally, as seen in longitudinal sections through the centre of the 

 tube ; siphuncle rather large, placed near the margin of one of the flat- 

 tened sides, and slightly contracted at the septa. Chamber of habitation 

 unknown. 



"The largest specimen collected is not quite five inches in length. At 

 a distance of a little more than half an inch from its smaller extremity 

 its maximum diameter is twenty-five millimetres, and at about a quarter 

 of an inch from its larger end the greatest thickness is twenty-seven 

 millimetres. 



"East Selkirk, Manitoba; two specimens, both collected in 1884, one 

 by Mr. T. C. Weston and the other by A. McCharles." 



Orthoceeas anellus, Conrad. 



Orthoceras ancllua, Conrad 1843. Proc. Ac. Nat. Sc. Philad., vol. I., 



p. 334. 

 Orthoceras andlum. Hall 1847. Pal. X. York, vol. I., p. 202, pi. 43 



figs. 6 a.-f. 

 Whitfield 1882. Geol. Wiscons., vol. IV., p. 22P 



7, fig. 13. 

 Orthoceras andlua,C\3.rV(! 1897. Geol. Minn., Final Rep., vol. lt.\. 



pt. 2, p. 784, pi. 43, figs. 22 and 23. 



West shore of Lake Winnipeg, about five miles north of Clark's Point, 

 and sixteen north of the mouth of the Little Saskatchewan, D. B. 

 Dowling, 1891 . one badly preserved and abnormally compressed specimen. 



Tripteroceras Lambii, Whiteaves. (Sp.) 



Oonioceras Lumhi, Whiteaves 1891. Trans. Royal Soo. Canada, vol. IX., 



sect. 4, p. 86, pi. 11, figs. 1 and 1 a-h. 



Triptoceras Lambi, Clarke 1897. Geol. Minn., Final. Rep., vol, III., 



pt. 2, p. 793, pi. 56, figs. 1 and 2. 



" Shell large, its body chamber unknown, the septate portion elongated, 

 compressed conical, but increasing very slowly in size, strongly compressed 

 on the dorsum and venter and broadly expanded at the sides, which are 

 ultimately sharply angulated ; lateral diameter a little more than twice 

 the dorso-ventral, the exact proportions being as two to five ; outline of 



