508 PALEONTOLOGY OF NEW YORK. 



SANGUINOLITES, McCoy. 1844. 



SaNGUINOLITES (?) UNDULATUS. 



PLATE JjaV, FIGS. 1, 2. 



In part Sdmondia utKiuUUa, Hall. Prelim. Notice Lamellibranchiata, 2, p 91. 1870. 

 " " " " Pal. N. y., vol. V, pt. 1. Plates and Explanations: PI. 64, figs. 1-4. 



1883. 



Shell small, elliptical ; length more than one-third greater than the height ; 

 basal margin gently convex. Posterior extremity broadly and regularly 

 rounded. Cardinal line straight. Anterior end short and regularly rounded 

 from just below the beaks. 



Valves uniformly convex below, gibbous above and in the umbonal region. 



Beaks at about the anterior third, but little elevated above the hinge-line. 

 Umbonal slope not distinguished from the general convex surface of the shell. 



Surface marked by fine concentric striae, which are fasciculate, giving ori- 

 gin to regular concentric undulations, which extend from the anterior end to 

 the post-cardinal slope. Interior unknown. 



Three specimens measure respectively 24, 22 and 21 mm. in length, and 

 14, 14 and 13 mm. in height. 



This species diflfers from the following (S. subtruncatus) in its stronger concen- 

 tric undulations, more rounded posterior extremity and the absence of an um- 

 bonal ridge. 



Formation and localities. In the sandy shales of the Chemung group, near 

 Great Valley and East Randolph, Cattaraugus county, N. Y. 



SaNGUINOLITES (?) SDBTRDNCATUS, n. sp. 

 PLATE LXIV, FIOS. 3, 4. 



In part Ednumdia undulata. Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 64, ligs. 1-4. 



1883. 



Shell small, sub-elliptical, truncate posteriorly; length more than one-third 

 greater than the height ; basal margin very gently curving, appearing to be 



