BRACHIOPODA. 173 



LiNGULA T^NIOLA, noin. IIOV. 

 Lingula lamellaia. Hall. Palseontnlogy N. Y., vol. ii, p. m, pi. xx, tig-.s. 4 a, h, c. 



(See page IS.) 



Lingula lingdlata, sp. nov. 



PLATE IV K, FI(i. 5. 



Shell elongate-subquadrate, having somewhat the form of Lingula oblata, Hall. 

 Valves very slightly convex. Distinguished from other species by the 

 peculiar detiection of the anterior portion of the shell considerably below 

 the plane of the lateral margins. 



Clinton group. Near Hamilton, Ontario. 



LiNGULOPS Granti, sp. nov. 



I'LATE IV K, FIGS. U. 1.5 



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 afibrd 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. 



