124 



[ Senate 



Meoanteeis elongatus. 



RhYNCHONELLA? ALVEATA (n. S.). 



Pal. N.Y. Vol. It. 



Shell longitudinally oval or subrhomboidal, much longer than 

 wide, sloping from near the middle towards the prominent beak 

 at an angle of about 70'' : dorsal valve trough-shaped, or having 

 a sinus so large as to involve its entire breadth below the mid-r 

 die ; lateral margins along the upper half curving down, and 

 occupying broad undefined sinuosities on each side of the beak 

 in the cardinal border of the other valve : ventral valve trans- 

 versely arcuate, and almost wholly included in the prominent 

 rounded mesial fold, from which it slopes rather abruptly to 

 the lateral margins ; beak extending beyond the opposite beak, 

 nearly straight. Surface smooth. 



Geological position and locality. Onondaga limestone, 



