No. 109.] 



81 



not so mueh so as the latter. It also resembles Terebratula eucharis of 

 Barbande ( Silur. Bracli. 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 

 and Sehoharie counties. 



: 2 



Rhtnchonella nobilis. 



Rhynchonella SPECIOSA. 



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 rounded 



dental laminss of' the opposite valve ; anterior and lateral mar- 

 [ Senate No. 109.] 6 



