380 REPORT ON THE STATE CABINET. 



Spieifera meta, n. s. 

 plate xiii, figs. 12, 13. 



Spirifer radiatus, pars, Hall. Palssontology N. Y., II, p. 66, Plate xxii, figs. 2s, 2t. 

 Compare Cyrtia myrtia, Billings. Palajozoic Fossils, p. 165, fig. 149. 



Shell small, semioval in outline. Ventral valve low pyramidal ; height 

 equal to one half the width, or a little less ; length and height nearly 

 equal ; hinge-line equaling the entire width of the shell ; ventral 

 valve with the area erect or slightly arcuate ; foramen narrow ; del- 

 tidium highly convex, perforated near the apex ; sinus broad, nearly 

 one-third the entire width of the valve, deep, and somewhat angu- 

 lar at the bottom. Dorsal valve regularly convex, the mesial fold 

 moderately elevated, very nai'row at the umbonal region ; the inte- 

 rior of the ventral valve possessing very strong dental lamellse, 

 which extend more than one-third its length. Exterior surface of 

 shell marked by a few distinct concentric lines of growth, and fine 

 close radiating strite. 



This species is of the type of Spirifer trapezoidalis , Dalman ; but differs 

 in its greater proportional width on the hinge, the less elevation of the 

 ventral and more convex dorsal valve. From ^S*. [Cjjrtia) myrtia', Billings, 

 it differs in the same particulars, as well as the rounding of the hinge- 

 extremities. In fact these two species, S. myrtia, and S. trapesoiclalis 

 are so closely allied that a careful comparison with each other might 

 lead to an identification. The specimens with elevated area, figured on 

 Plate xxii. Vol. ii, Palaeontology, N. Y., as varieties of S. racliata, are of 

 this species. 



Formation and Locality. — In limestones of the age of the Niagara group, 

 near Milwaukee, Wisconsin, and in the Clinton group, at Rochester, N. Y. 



Spirifeea nobilis, Barrande. 



PLATE VIII, FIGS. 11, 15 16, 17. 



Spirifer nobilis, Bareande. Silurisehe Brachippd. Bohmen; in Haidingee's Naturwissen 



schaftliche Abhandlungen, Band 2, Tab. xviii, flg. 2, a, b. 

 Spirifer racinensis, M'Chesnet. Palaeozoic Fossils, p. 84. 1861. 

 Spirifer inconstans, Hall. Rep. Progress Geol. Survey Wisconsin for 1860, p. 26. 1861. 



Shell transversely elliptical, the length a little more than half the 

 width ; hinge-line two-thirds as long as the greatest width of the 

 shell ; cardinal extremities rounded ; both valves moderately con- 

 vex, marked by strong angular dichotomizing plications. Dorsal 



