Contributions to Invertebrate Palaeontology. 573 



SPECIES FROM THE HURON SHALES. 



MOLLUSCOIDEA. 



BRACHIOPODA. 



Genus L.I1VGUL.A Brugiere. 



L.ingiila ligea. 



Plate XI, figs. 3 and 4. 



Lingula ligea Hall, Pal. N. Y., vol. 4, pp. 7 and 8, pi. 1, fig. 2. 



Shell elongate-oval, widest in the middle, and nearly twice as long as wide, 

 very slightly pointed at the upper end and neatly rounded in front, surface 

 of the valve regularly and evenly convex, and marked only by very fine con- 

 centric lines of growth. 



In the interior of the shell the median line is marked by an 

 elevated ridge, representing muscular scars, which reaches fully 

 two-thirds the length of the valve. The impression contains four 

 elements, two above and two below, the upper pair enclosing the 

 upper half of the lower. Near the rostral extremity another widely 

 diverging pair of scars are seen, which also appear double. 



The specimen is undistinguishable from examples of L. (D.) ligea 

 Hall, from New York, where it occurs in the Hamilton and Portage 

 groups. The median line of muscular scars and the diverging 

 rostral scars show that it belongs to the section of the Lingulidse 

 for which Prof. Hall proposed the generic name Dignomia. 



Formation and Locality. — In the calcareous nodules from the 

 Huron shales at Delaware, and also from the Erie shale, at Leroy, 

 Lake Co., Ohio, with Echinocaris, etc. 



Plumiilites IVewtoerryi. 



Plate XII, figs. 6-11. 



Ffumulites Newberryi Whitf., Ann. N. Y. Acad. Sci., 1862, p. 217. 



The specimens for which the above specific name is proposed, 

 consist of several detached plates, and of one of several plates, 



