260 



obliquely compressed ; last whorl of the spire angulated and carinated 

 below, next to the suture ; outer whorl obliquely compressed above, 

 rounded and almost imperforate below, the umbilicus being represented 

 by a minute, short and very narrow chink behind the columellar lip ; 

 aperture ovately subcircular ; lip thin and simple. 



" Surface encircled by small narrow and acute spiral keels. On the last 

 whorl but one there are five of these keels, and on the outer whorl eleven. 



"Portage road at falls : two specimens." 



LoxoNEMA, sp. indet. 



Foot of portage road, a specimen of a small, slender species, with six 

 whorls preserved ; and, upper rapid, a much more imperfect but otherwise 

 similar specimen. Portage road at falls : a fragment of a larger shell, with 

 apparently similar characters, but with only two of the whorls preserved. 



Orthonychia obtusa, Whiteaves. 

 Plate 29, figs. 5, & 5 a. 



Orthonychia obtusa, Whiteaves 1904. Geol. Surv. Canada, Ann. Rep., vol. 



XIV, pt. F, p. 51. 



" Shell straight, conical, slightly compressed at the sides, but more so on 

 the right than on the left side, and moderately elevated, the height being 

 less than the maximum length at the aperture or base Apex erect, 

 bluntly pointed and rather eccentric ; base with two faint, obscure, shallow 

 undulations on the right side. Aperture and outline of transverse section 

 at and near the base, subovate but somewhat irregular in outline ; lip 

 shallowly undulated on the right side. 



" Surface markings unknown, though casts of the interior are quite 

 smooth, and the exterior of large pieces of the thin and presumably inner 

 layer of the test, that happen to be preserved, is marked with numerous, 

 irregular and often not continuous, fine concentric strise. Muscular 

 impressions unknown. 



" Foot of portage road : two specimens, which are very difierent in shape 

 to any species of Orthonychia or PCatyceras that the writer is acquainted 

 with. 



Platyceeas compactum, Whiteaves. 



Plate 29, fig. 6. 



Platyceras compactum, Whiteaves 1904. Geol. Surv. Canada, Ann, Rep., vol. 



XIV, pt. F, p. 52. 



" Shell turbinate, imperforate, a little wider than high, spire small and 



short. Whorls certainly three and probably as many as four or five' in 



perfect specimens (the apex being broken in both of those collected) 



