258 



" Portage road at falls : seven specimeDS, all of which are imperfect at 

 the aperture. The largest is seventy-two millimetres in its maximum 

 diameter. ^ 



" The generic name Megalomphala, Ulrich, 1897, is, however, too close 

 to Megalomphalus, Brusina, 1871." 



Salpingostoma bobeale, Whiteaves. 



Plate 28, figs. 10 & 11. 



Salpingostoma boreaie, Whiteaves 1904. Geol. Surv. Canada, Ann. Rep. vol. XIV, 



pt. F, p. 49. 



Shell small, consisting of three rounded volutions that are a little wider 

 than high and coiled on the same plane, in close contact, with little 

 or no overlap, or at least closely contiguous if not actually in contact ; 

 umbilicus wide and open, exposing most of the inner whorls. Aperture 

 trumpet shaped, lip widely and abruptly expanded. 



" Surface marked with minute rounded spiral ribs, that are crossed by 

 small, crenate, lamellose raised ridges. The slit-band is not well shown in 

 either of the few specimens collected, but it seems to be narrow, and con- 

 tinuous, at least at some distance behind the aperture. 



"Middle rapid, foot of portage road, and portage road at falls; one speci- 

 men from each of these localities. The largest of these specimens, though 

 only twenty-three millimetres, or less than an inch, in its maximum dia- 

 meter, has an abruptly expanded aperture. The other two are obviously 

 immature shells, each about eleven mm. in its greatest diameter. In one 

 of them the posterior half of the earliest volution is free from, and not 

 quite in contact with that which immediately succeeds it. 



" It is only in the continuity of the slit-band that this species and shells 

 of this genus are supposed to differ from Tremanotus, or as Dr. Paul 

 Fischer spells it, Trematonotus." 



EuoMPHALUs, sp. indet. 



Lower rapid : a cast of the interior of the outer half of the outer volu- 

 tion of the shell, apparently of a typical Euomphalus, which is flattened 

 above, rounded, transversely undulated, and not very widely umbilicated 

 below. 



Gyronema speciosum, Whiteaves. 



Plate 29, fig. 2. 



Gyronema speciosum, Whiteaves 1904 . Geol. Surv. Canada, Ann. Rep., vol. XIV. 



pt. F, p. 50. 



" Shell quite large for the genus, imperforate, turbinate, a little higher 

 or longer than wide, spire slightly higher than the outer whorl. Whorls 



