36 



Of this species I have seen only one specimen and that is a cast of the 

 interior. At first sight it might be taken for a species of Holopea but 

 owing to the spiral band it more probably does not belong to that genus. 



Locality and Formation. Near L'Orignal. Black River limestone. 



Collector. R. Bell. 



SUBULITES PARVULUS. (N. Sp.) 



Description. Shell small, fusiform, much curved below the middle. 

 Spire of four or five whorls, the last one rather more than half the whole 

 length ; whorls depressed convex, almost flat ; suture not deep. Length 

 about 1 inch ; width at about the mid-length 5 lines. Surface unknown. 



The greatest width is about the middle or a little below. From this 

 point the shell tapers in both directions, with a rounded slope to the apex and 

 with a broad rounded curve in the base of the last whorl. The side 

 opposite the aperture forms in outline a regular arch from the apex to the 

 lower extremity of the aperture. The height of this arch measured in the 

 middle is a little greater than the width of the shell. The suture is so 

 slightly impressed that when the shell is preserved the spire must be a 

 nearly smooth cone. 



There is a species very like this in the limestones of the south side of 

 the Straits of Belle 1 Isle. 



Locality and Formation. Paquette Rapids on the Ottawa River ; 

 and near L'Orignal. Black River limestone. 



Collectors. E. Billings, R. Bell. 



Genus METOPTOMA, (Phillips.) 



METOPTOMA (Phillips). Geology of Yorkshire Part, 2. p. 223, 1836. 



Generic characters. Shell univalve, patelliform, more or less conical ; 

 apex anterior, either erect or incurved forwards. External surface either 

 smooth or horizontally or vertically striated or ribbed. Internal surface 

 either smooth or with a crescentiform row of small circular or oval mus- 

 cular impressions open towards the anterior extremity. 



Prof. Phillips confines this genus to such as have " the face under the 

 apex " truncate. There is, however, as is well shewn by our specimens a 

 gradation between those with the aperture oval or circular and those which 

 have it straight in front and curved at the sides and posterior margin. 

 These shells are referred by some to Capulus and by others to Patella 

 both of which names have been used by me also. But we have now two 

 species from the Quebec group which shew that the muscular impressions 



