No. 109.] 81 * 



not so much so as the latter. It also resembles Tcrebratula eucharis of 

 Barrande ( Silur, Brach. aus Bomen, pi. 17, f. 2) ; but is more gibbous 

 in old specimens, and more elevated in front, as well as more finely pli- 

 cated. 



Geological position and locality. Upper Pentamerus limestone, Albany 

 iind Schoharie counties. 



RhYNCHONELLA N0BILI3. 



Rhynchonella BPECIOSA. 



Pal. N.Y. Vol.iii, pi. 103 a, f.l. 



Shell longitudinally ovoid, vertically flattened on the sides, higher 

 than wide, abruptly rounded or subtruncate in front ; sides 

 nearly parallel ; no sinus in either valve : dorsal valve extreme- 

 ly elevated, abruptly deflected on each side towards the opposite 

 valve ; beak incurved ; cardinal margin on each side of the beak 

 profoundly sinuate, for the reception of the prominent rolinded 

 dental laminse of the opposite valve ; anterior and lateral mar- 

 [ Senate No. 109.] 6 



