296 

 Ilionia (?) PARVULA, Whiteaves. 



Saskatchewan River, below Cedar Lake, J. B. Tyrrell, 1890 : an imper- 

 fect cast of the interior of a single valve of a shell that seems to be refer- 

 able to this species, as described on page 288 ante, and figured on Plate 

 28. 



Gasteropoda. 



Phanebotrema occidens. Hall. (Sp.) 



Plewrotomaria labrosa, var. occidcns, Hall.. 1864. Eighteenth Rep. Reg. Univ. St. N. 



York, p. 343. 

 Pleurotomaria occidens. Hall 1867. Twentieth Rep. Reg, Univ. St. N. 



York, p. 364, pi. 15 (6), figs. 11 and 12. 

 PfeMWroirema occirfcms, Ulrich and Scofield . 1897. Geol. and Nat. Hist. Surv. Minn., 



Final Rep., vol. Ill, pt. II, p. 952. 



Saskatchewan River, at Grand Rapids, below Old Portage, J. B. Tyrrell, 

 1 890 : a cast of the interior of a specimen that appears to be referable to 

 this species. 



In Mr. Tyrrell's collections from the Saskatchewan, there are, also, frag- 

 mentary and indeterminable specimens of several other species of gaster- 

 opoda, belonging apparently to the genera Pleurotomaria, Murchisonia, 

 Looconema, Euoinphalus, and Poleumita. 



Cephalopoda. 

 Spyeoceras, sp. indet. 



Longicone, slender, straight ; test unknown, surface of the cast marked 

 with nearly straight, transverse, annular ribs, and with minute, longi- 

 tudinal and continuous, raised lines. Characters of the interior of the 

 shell unknown. 



Saskatchewan River, at Chemahawin, J. B. Tyrrell, 1890 : a portion of 

 a cast of the interior of the shell, nearly forty-five millimetres in length, 

 by about thirteen mm. in width at the larger end. 



In some respects this specimen is not unlike the type of S. meridionale 

 from Stonewall, described on page 281 and figured on Plate 30 (fig. 9) 

 of this volume, but the Stonewall shell is distinctly curved, and shews 

 no traces of fine longitudinal raised lines. 



GoMPHOCERAS PAEVULUM, Whiteaves. 

 Plate 35, figs. 2, 2 a, and 2 h. 



Oomphoceras parvulum, Whiteaves 1891. Canad. Rec. Sci., vol. IV, p. 298, pi. 



3, figs. 5, and 5 a, b. 



" Shell small, straight, slender, rather more than three times as long as 

 broad, and broadest a little in advance of the midlength ; sides slightly 

 compressed, the outline of a transverse section near and at the commence- 



