207 



longitudinal section of the shell, showing the edges of the septa and the 

 lateral margins next to the test, as well as the siphuncle. The latter is 

 seen to be eccentric and sublateral but not quite marginal, and to occupy, 

 at its thickest part, rather more than one-third of the entire diameter. 

 As exposed in this section, the septa are seen to be rather deeply 

 concave internally, but the nature of the markings of the exterior of the 

 test is still unknown. 



ACTINOCEEAS RiCHAEDSONII, StokeS. 



Actinoceras Richardsonii, Stokes 1840. Trans. Geol. Soo. Lond., ser. 2, vol. 



v., pt. 3, p. 708, pi. 59, figs. 2 and 3. 

 ? Ormoceras Brongniarti, D. Dale Owen 1852. Geol. Rep. Wiscons., Iowa and Minn., 



p. 181. 

 -4ciinoccras ii/oni, Whiteaves (non Stokes).. 1880. Geol. Surv. Canada, Rep. Progr., 



1878-79, pp. 460 and 48o of Appendix 1. 

 Actinoceras Bichardsoni, Foord 1888. Cat. Foss. Cephal. Brit. Mus., pt. 1, 



p. 172. 

 M II Whiteaves 1891. Trans. Royal Soe. Canada, vol. IX., 



seut. 4, p. 83, pi. 9, figs. 1, 2 and 2a. 



Western shore of Lake Winnipeg, " near the First and Second Rocky 

 Points,'' north of the Saskatchewan, where specimens were collected by 

 Sir John Richardson on Franklin's first expedition in 1814, and subse- 

 quently by Captain Back in 1832. Specimens have since been collected 

 by Mr. Dowling, in 1891, at nearly or possibly the same place, viz., on the 

 west shore of Lake Winnipeg, opposite the north end of Selkirk Island, 

 and at the north end of that island ; also at Clark's or Limestone Point, 

 •eleven miles north of the mouth of the Little Saskatchewan. It is 

 apparently abundant at Lower Fort Garry, where it was collected by 

 D. Dale Owen in 1848, by Sir James Hector in 1857, by Donald Gunn 

 in 1858, by Dr. R. Bell in 1879 and 1880, and by T. C. Weston and A. 

 McCharles in 1884. It occurs also at East Selkirk, where it was col- 

 lected by Mr. Weston and Mr. McCharles in 1884. 



This species is represented in the Museum of the Survey by a fine 

 series of specimens from the Red River valley. These shew that the 

 rate of tapering in some specimens is rather more rapid than has gene- 

 rally been supposed. Thus, in the original of fig. 1, on Plate 8, of the 

 ninth volume of Transactions of the Royal Society of Canada, in a 

 length of four inches the maximum diameter of the shell increases from 

 thirty-seven millimetres at the smaller end to sixty at the larger. The 

 outline of a transverse section is usually circular, except when the speci- 

 men has been abnormally compressed. The surface markings consist of 

 rather regularly disposed transverse and imbricating strise. The septa, 

 as described by Mr. Foord, are " four lines distant where the shell has 

 a diameter of three inches," and arch strongly forward and outward. 



