87 



base upwards to the apex, which in the cast is acute, erect and situated at 

 about one-third the length from the anterior margin. Surface unknown. 



Length of the specimen at the base, 9 Imes ; width, 8 lines ; height, 

 8i lines. 



Locality and Formation. — Point L^vis. In limestone No. 2, Quebec 

 group. 



OoUectors. — J. Richardson, R. Bell. 



Mbtoptoma Htrib. (N. sp.) 



Ctbtodonta. — (Billings.) Canadian Naturalist and Geologist, vol. 5 p. 201. 

 a b 



r 



Fig. 79. 

 Fig. 79. — Metoptoma Hyrie. — a, View of the upper side j 6, side Tiew. 



Description. — This species is almost identical with M. Nycteis, described 

 and figured at page 37, 38, of this series of papers. The only difference 

 is that the beak is incurved down nearly to the plane of the lateral mar- 

 gin, whereas in M. Nycteis it is elevated about two-thirds the whole height. 

 The form is an uniform oval, narrowed to an acutely rounded point at the 

 beak ; sides gently convex ; posterior margin broadly rounded ; greatest 

 width about the middle, or a little nearer the beak. On a side view the 

 outline is nearly regularly arched from the beak to the front, the greatest 

 height being a little nearer the beak than the mid-length. Surface un- 

 known. 



Length of large specimen, 21 lines ; width, 14 lines ; height, 9 lines. 

 The specimens vary somewhat in their proportions. 



Locality and Formation. — Point L^vis ; in limestone No. 2, Quebec 

 group. 



Collectors. — Sir W. E. Logan, J. Richardson, R. Bell, T. Weston. 



