59 



last ten, and of the fourth from the base, seven lines. The band is very 

 distinctly indicated and close to the basal margin of the whorl. The sur- 

 face has a gently convex slope. 



In its proportions this species is very near M. Ilche ; but the position of 

 the band distinguishes it therefrom. It also occurs in a higher formation. 



Locality and Formation. — Head of the Falls of the Dartmouth River ; 

 Gaspe sandstone. 



CoUector.--R. Bell. 



Pleuotomaria princessa. (N. sp.) 



Fig 29. 



Fig. 29. — Pleuotomaria princessa. 



Descrij)tio7i. — The only specimen of this species collected consists of 

 the two last whorls. From these it would appear that the apical angle is 

 about 80°. The transverse section of the whorls is nearly circular. On 

 the upper margin of the whorls, next the suture, there is a band which is 

 about two and one-half lines wide at the aperture, and becomes gradually 

 narrower above. At its outer edge there is a narrow sharply elevated 

 keel which may represent the respiratory band. Where it terminates 

 there is a small notch in the lip. The remainder of the surface is orna- 

 mented by a number of spiral ridges, each less than half a line in width, 

 and about a line distant from each other. As the whorls increase in size, 

 new ridges are intercalated between the old. These are crossed by fine, 

 sub-lamellose, vertical striae, four or five in the width of one line. In 

 crossing the ridges the striae are all curved backwards. 



The umbilicus, in this specimen, is concealed, and must be, judging 

 from the form of the basal whorls, very small. The form of the apex is 

 not clearly indicated, but it appears to have been much depressed, or 

 nearly flat, as represented in the figure. It may be that this appearance 

 is due to pressure, or the absence of the apical whorl. 



Locality and Formation. — Between Cape Gasp(i and Cape Rosier. 



Collector. — Sir W. E. Logan. 



