320 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



(S.) EUNEMA SPECIOSUM. (N. Sp.) 



Plate 42, fig. 5. 

 Shell ovate turbinate, a little longei' than broad, base ventricose, imper- 

 forate ; spire moderately elevated, but shorter than the outer volution, 

 which is encircled with six nodulose ridges or spiral keels. Volutions 

 about five, the two apical ones obliquely compressed, the third and fourth 

 angulated both above and below, and encircled with two distant nodulose 

 spiral ridges, with a shallowly concave oblique depression between them ; 

 outer volution bearing one prominent nodulose spiral ridge near the suture, 

 on the apical side, — another a little above or behind its midlength, with a 

 broad, obliquely, flattened and shallowly concave depressed zone between 

 them, — a third, at a short distance below or in advance of the second, — 

 and three similar but smaller and more closely disposed nodulose ridges 

 around the centre of the base ; suture angular and deeply impressed ; 

 aperture nearly circular ; outer lip simple ; columellar lip thickened and 

 somewhat reflected below. 



(Surface marked Vjy transverse but somewhat oblique lines of growth, in 

 addition to the nodulose or tuberculated spiral keels. 



Dawson Bay, Lake Winnipegosis, at Whiteaves Point and on two 

 small islands west and south-west of that point, at an exposure about 

 two miles west of Salt Point and at the mouth of Steep Bock Biver, 

 J. B. Tyrrell and D. B. Dowling, 1889 ; a few specimens from each of 

 these localities. 



Most of these specimen are well preserved moulds of the exterior of 

 the shell, in dolomite, with casts of the interior in place, the intermediate 

 test being absent. Three of the specimens, however, are entirely testi- 

 ferous. The largest example collected, when perfect, must have Iseen 

 fully lin inches in length. The nodules or tubercles on the spiral ridges of 

 the later volutions are very feebly developed in half-grown shells, but on 

 the outer volution of adult individuals they are moderately elevated, 

 rounded, conical and placed at distances apart about equal to or a little 

 greater than their own diameters at the base. Casts of the interior of the 

 shell are perforated by a narrow but deep umbilicus. 



The species has much the same shape as the Eunema capitaneuin 

 (^Tiirbo capitaneus, Goldfuss), but in that species the outer volution is 

 encircled by five comparatively large nodulose ridges, which alternate with 

 five rows of smaller tubercles. 



(S.) Eunema brevispira. (N. Sp.) 



Plate 42, figs. 6 and 7. 

 Shell turbinated, spire short, about equal in height to one-half of that of 

 the outer volution near the aperture : base ventricose, imperforate : outer 



