NIAGARA FALLS AND VICINITY 



199 



Found in the upper Clinton limestone and the Clinton lenses and 

 abundantly throughout the lower and middle Rochester shale at 

 Niagara. Also at Lockport and elsewhere (Hall). 



Spirifer crispus (Hisinger) (Fig. 118) (Hall. 1852. Pal. N. Y. 

 2:262, pi. 54) 



Distinguishing characters. Small size; very convex pedicle valve 

 with incurved beak and high area, which does not extend to car- 



Fig. 118 Spirifer crispus 



dinal extremities; broad rounded plications, from six to eight on 

 each valve, strongest near the fold and sinus ; fine, elevated, thread- 

 like concentric striae. 



Found in the Clinton lenses and the lower and particularly the 

 middle Rochester shale (Bryozoa beds) at Niagara. Also at Lock- 

 port and elsewhere (Hall). 



Spirifer crispus var corallinensis Grabau. (Geol. soc. Am. Bui. 

 11:352; Hall. 1852. Pal. N. Y. 2:328, pi. 74, fig. 9a-h) 



Distinguishing characters. Uniformly obsolescent plications, an- 

 gular mesial sinus; otherwise like preceding. 



Found in the Clinton lower limestone, the lenses, and the lower 

 Rochester shale. Not abundant. This variety connects S. cris- 

 pus with S. eriensis. It is characteristic of the Coralline 

 limestone of eastern New York. 



Spirifer eriensis Grabau (Fig. 119) 

 (Geol. soc. Am. Bui. 2:366, pi. 21) 



Distinguishing characters. Ventricose 

 pedicle valve, of subrhomboidal outline, 

 high area, pronounced angular mesial sinus 



uniformly increasing in width forward, strong frontal emargination; 

 sinus bounded by strong rounded prominent plications, with fainter 



Fig. 119 Spirifer eriensis 



