86 



valves moderately convex; the hinge line straight and sometimes two 

 inches wide ; surface smooth. The area of the ventral valve is about one 

 line m height at the beak ; The foramen triangular, and about as wide as 

 it is high. In the interior there is a small triangular chamber just in front 

 of the foramen, with an obtuse tooth on each side. The area of the dorsal 

 valve is somewhat smaller than that of the ventral, and the foramen is 

 neai-ly of the same size. In front of the foramen there are two indistmct 

 ovate muscular impressions, one on each side of the median line, with a 

 shghtly developed mesial septum between them. These scars are longitu- 

 dinally striated, and there are some faint indications of subdivision of 

 each. They, no doubt, represent the two pairs of occlusor scars of the 

 generality of the brachiopoda. 



The specimens are sihcified, and were procured by dissolving nodules of 

 limestone in hydrochloric acid. Several of the fragments obtained in this 

 way show that all the front half of both valves is very thin and fragile, 

 and that in one, most probably the ventral valve, there is a shallow rounded 

 mesial sinus, with a corresponding elevation in the dorsal. This species 

 appears tohe aMied to Stricklandia (Pentamerus) microcamerus (M'Coy), 

 and appears to be preserved in the same way, i. e., only the parts around 

 the beak and hinge line remaining. I have specimens of what appear to 

 be portions of the two valves of JM'Coy's species, and although the two 

 seem to be closely alhed, yet ours has the muscular impressions in the 

 dorsal valve much larger. 



Locality and Formation. — Point L^vis ; in the upper part of limestone 

 No. 2, Quebec group. 



Collectors. — Sir W. E. Logan, J. Richardson. 



GASTEROPODA. 

 Genus Metoptoma. (Phillips.) 



In my paper on the fossils of Point L^vis, in the Canadian Naturalist 

 and Geologist, vol. 5, these shells were referred to Patella, and afterwards 

 to Capulus : I thmk it more probable that they belong to Metoptoma. A 

 number of other undescribed species are known to me in the Lower 

 Silurian rocks of Canada. 



Metoptoma Melissa. (N. sp.) 



Description. — Shell obhquely conical, the base uniformly broad oval, a 

 little narrower at the front than at the posterior margin, tapering from the 



