*HITEAVES ] DEVONIAN FOSSILS OF JIANITOBA, ETO. 317 



Surface nearly smooth, marked only with very faint but close set 

 incremental strisv, which curve very gently backward on the upper or 

 apical side, and rather more strongly forward on the lower side of the 

 two spiral keels, which form the outer boundaries of the slit band ; 

 crescents very indistinctly defined, but apparently as closely disposed as 

 the incremental striw. 



Western shore of Dawson Bay, Lake Winnipeg\)sis, at the mouth of 

 Steep Rock River, D. B. Dowling, 1888 : one imperfect but beautifully 

 preser\ed specimen, with the whole of the test preserved on three of the 

 later volutions. A few sharply defined moulds of the exterior of shells of 

 this species were obtained by Messrs. Tyrrell and Dowling, in 1889, at 

 \Yeston Point, Lake Winnipegosis ; also at Dawson Bay, in the same lake, 

 at Whiteaves Point, on a small island half way between that point and 

 Salt Point, at exposures two miles west of Salt Point, and on the 

 second small point north of the mouth of the Red Deer River. The 

 fiffure on plate xli. is taken from a gutta percha impression of one of 

 these moulds. 



This species appears to differ from the preceding one in its much more 

 slender form, more numerous volutions, and in the circumstance that its 

 spiral keel is not only double, but placed distinctly below the centre of 

 each volution. The writer desires to associate with it the name of its 

 discoverer, Mr. D. B. Dowling, B. Sc, of the Geological Survey of Canada, 

 who collected many of the specimens mentioned in this report. 



(S.) Bellerophon Pelops ? Hall, vak. 



Plates 4i, figs. 2, 2a and 3, and 45, fig. 4. 



Cfr. Bi-Jleroiihoii (Biuunia) P(dopx,'H.-d.\\. 1861. Descr. New .Spec, Foss., etc., p. 2S. 



" 1862. Fifteenth Reg. Rep. X. Y. .St. Gali. 

 Nat. Hist., p. .56. 

 " BtUerophon Pdops,^-^^. 1876. lUustr. Dev. Foss. Gasterop., pis. xx. amlxxv. 



1879. Pal. St. N. York, vol. V, pt. 2, p. 0.5, pi. xxii, 

 figs. 7-1^3. 



Shell subglobose, body volution ventricose and expanded at the aperture : 

 umbilicus apparently closed at all stages of growth, when the test is 

 preserved, though in young or half grown specimens the closing of the 

 umbilicus is clearly not caused by a "callus of the lip " or columellar 

 expansion : outer lip, in the only adult specimen collected, which is an 

 imperfect cast of the interior, apparently shallowly incised at the outer 

 termination of the slit band and broadly rounded on each side, though 

 in immature examples, such as the original of figs. 2 and 2a on Plate xlii, 

 the slit band seems to end anteriorly in a long and narrow slit : centre of 

 the periphery encircled by a narrow and slightly elevated, flattened slit 



