21 



wide as the ridges themselves : below this the revolving ridges are muoh 

 more numerous and closely disposed, their breadth in the lower half of 

 the body-whorl being fully equal to the width of the grooves between 

 them. 



Approximate height of the most perfect specimen, thirty-seven 

 millimetres : maximum breadth of the same, forty-four mm. : height 

 of the body-whorl of do., twenty-four mm. 



The amount of elevation of the spire of Canadian examples of this 

 species, as compared with the maximum breadth, varies considerably 

 in different individuals. 



EUOMPHALUS GALTENSIS. 

 Plate 3, figs. 9 and 9a. 



Shell depressed and nearly discoidal, spire sunk slightly below the 

 highest level of the body-whorl, breadth rather more than twice the 

 height : volutions three, increasing very gradually in size, those of the 

 spire shouldered and nearly rectangular : body-whorl biangulated, but 

 with the basal angle somewhat rounded off, — depressed above, especially 

 near the suture, compressed convex below and flattened laterally in 

 the middle : umbilicus about one-third the diameter of the base, deep, 

 step-sided and exposing part of the inner volutions : outer lip more or 

 less acutely insinuated or notched on the superior angle, above and 

 below which its margin is convexly cm'ved, the insinuation being 

 caused by the junction or partial intersection of these two convex 

 curves. Surface markings unknown, with the exception of a few 

 distant lines of growth on the body-whorl, which run parallel with the 

 outer lip. 



Dimensions of the specimen figui-ed : — breadth, thirty-eight milli- 

 metres ; height, seventeen mm. ; width of umbilicus, about twelve mm. 



Gait, E. Eillings, 1857. Hespeler, T. 0. Weston, 186Y. Dui-ham, Mr. 

 J. Townsend. All the specimens obtained so far are either mere casts 

 or else they have the test so muoh exfoliated that the finer sui'face 

 markings are quite obliterated. 



Strapaeollus crendlatus. (N. Sp.) 

 Plate 3, fig. 8, 8a and 86. 



Shell turbinate, compressed vertically, height one third less than the 

 maximum breadth, whorls three to four : spire short, about one-third 

 the entire height, somewhat conical, its volutions being obliquely 

 rounded : suture excavated : bodj'-whorl compressed vertically both 



