BRACH10P0DA. 
173 
Lingula t^eniola, nom. nov. 
Lingula lamellata, Hall. Palaeontology N. Y., vol. ii, p. 55, pi. xx, figs. 4 a, b, c. 
(See page 18.) 
Lingula lingu^ata, sp. nov. 
PLATE IV K, FIG. 5. 
Shell elongate-subquadrate, having somewhat the form of Lingula oblata, Hall. 
Valves very slightly convex. Distinguished from other species by the 
peculiar deflection of the anterior portion of the shell considerably below 
the plane of the lateral margins. 
Clinton group. Near Hamilton, Ontario. 
Lingulops Granti, sp. nov. 
PLATE IV K, FIGS. 14. 15. 
Shell small, linguloid in external aspect. Outline elliptical, subacuminate 
at the posterior extremity. External surface marked by faint, elevated, 
equidistant concentric lines. Margin of contact broad and conspicuous about 
the entire periphery. On the interior of the pedicle-valve the margin is 
broadest beneath the beak and slightly grooved on its posterior edge for the 
passage of the pedicle. The central and lateral muscular scars are elevated 
on a well developed platform, the ante-lateral margins of which meet each 
other at an acute angle. In the brachial valve the posterior margin is also 
broad and faintly grooved, the platform more conspicuously developed both 
in length, width and height than in the other valve, while the muscular scars 
have essentially the same arrangement. In neither valve do the specimens 
at hand afford evidence of the arched parietal impressions seen in the other 
species of the genus. Length of an average specimen, 5 mm., width, 3 mm. 
This species differs from L. Whitfieldi and L. Norwoodi, not only in the absence 
of the parietal scars, but also in the development of the muscular area of the 
pedicle-valve into a distinct platform, and in the absence of the anterior longi¬ 
tudinal septum in the pedicle-valve. 
Niagara group. Hamilton, Ontario. 
