262 



Stbophostylus amplus, "Whiteaves. 

 Plate 30, figs. 1, and 1 a. 



Strophostylus amplus, Whiteaves 1904. Geol. Surv. Canada, Ann. Rep., vol. 



XIV, pt. F, p. .53. 



" Shell imperforate, subglobose, widely expanded and slightly depressed, 

 about as wide as high, spire small and very short. Whorls four, increa- 

 sing very rapidly in size, those of the spire rounded ; the outer one 

 moderately convex as viewed dorsally, expanded widely in the direction of 

 its height, widest above the midheight and rather narrowly rounded at 

 the base ; suture distinctly impressed ; aperture very large, apparently 

 widely subovate ; outer lip thin and simple ; characters of the columella 

 not well shown in either of the specimens collected ; posterior portion of 

 the outer lip extended considerably so as to embrace part of the prece- 

 ding whorl. 



" Surface marked with fine transverse strise of growth, which are curved 

 convexly forward parallel to the outer lip. 



"Portage road at falls : three specimens, which do not show the exact 

 shape of the aperture at all well. The interior of each is completely filled 

 with stone, so that the inner edge of the colunjella is covered, but in one 

 of the specimens there are indications of a flexuous longitudinal groove 

 Just behind the columella." 



Strophostylus inflatds, Whiteaves. 

 Plate 30, figs. 2 and 3. 



Strophostylus inflatus, Whiteaves 1904. Geol. Snrv. Canada, Ann. Rep., vol 



XIV, pt. F, p. f)3. 



" Shell subglobose, naticoid, imperforate, about as wide as high, spire 

 short. Whorla probably four in perfect specimens, though not more than 

 three are preserved in the most perfect specimen collected, increasing 

 rapidly in size, the outer one inflated and ventricose, most convex at 

 about its midheight ; aperture not well shown in the specimen described, 

 but apparently subovate ; outer lip thin and simple, its posterior portion 

 apparently not so extended as to embrace part of the previous whorl. 



" Surface marked with obliquely transverse lines of growth. 



" Portage road at falls : a cast of the interior of the shell of a large 

 specimen with small portions of the test preserved, from which the fore- 

 going description was made, and two small specimens ; also a large testi- 

 ferous specimen (fig. 3) that is probably referable to this species, though 

 its outer whorl is considerably compressed laterally." 



