322 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



1-ently imperforate. Volutions three, or pei'haps four, the apex being 

 rather imperfectly preserved in the few specimens collected, increasing 

 rapidly in size, the nuclear one.s small and apparently smooth, the last but 

 one obliquely compressed above, rounded below and encircled with six 

 close-set, regularly disposed, line tuberculated spiral ridges ; outei- volu- 

 tion much broader than high, broadest near the base, somewhat com- 

 pressed above, truncated obliquely at the aperture and encircled with six 

 or more spiral rows of tubercles, some of which are spinose or subspinose, 

 especially those on the upper row and those on the liiwest : suture deeply 

 impressed. 



Surface marked )iy oblique lilies of growth which run parallel to the 

 outer lip. In one specimen, also, there are indications of a minute raised 

 line between each pair of rows of tubercles cm the outer volution. 



Approximate dimensions of the most pei'fect specimen collected ; height 

 about twelve millimetres ; maximum breadth of the outer ^•olution, about 

 ten ram. 



Dawson Bay, Lake Winnipegosis, at the mouth of the Red JJeer River, 

 D. B. Bowling, 1888, about two miles west of Halt Point, and at the 

 tirst small point north of the mouth of the Red Deer River, J. B. Tyrrell, 

 1889 : one well preser\-ed mould of the exterior of the shell from each of 

 these localities. The figure represents a gutta percha impression taken 

 from one of these natural moulds. 



(S.) EUNEMA CLATIIRATULUM. (N. Sp.) 



Plate 42, fig. 9. 



Shell small, turbinated, somewhat turreted, height a little greater than 

 the maximum breadth, spire rather higher than the outer volution, which 

 is nearly twice as broad as high, base imperforate. Volutions five, in- 

 creasing much more rapidly in breadth than in height, the first, second 

 and third comparatively slender, the fourth considerably expanded, — the 

 second, third and fourth obli(|uely compressed above, angular or sub-angu- 

 lar in the centre, and with nearly vertical sides below • suture distinctly 

 defined ; outer volution \entricose and much expanded laterally, .somewhat 

 flattened at the base. 



Surface marked by fine spiral ridges, which ai'e crossed by -i-ery nume- 

 rous, close-set, regularly disposed and nearly straight, minute laminar 

 costulie, the points where the former are intersected by the latter being 

 minutely tuberculated, when examined under a lens. In the specimen 

 figured, which though unusually perfect, is not more than half grown, 

 there are two or three distant spiral ridges on the last volution but one, 



