130 PALAEONTOLOGY OF ILLINOIS. 



Beaks not prominent, and situated close to the anterior ex- 

 tremity. The specimen is a cast, and shows no surface mark- 

 ings. 



Length ! 7 /ie inches; greatest height ri /i6 inch. 



Position and locality: Burlington limestone, Calhoun county, 

 Illinois. 



Collector, A. H. Worthen. 



No. 2541 of the Illinois State Museum. 



SANGUINOLITES RANDOLPHENSIS. Worthen. 



PL XX, Figs. l-la. 

 Cypricardia? randolphensis, Worthen, 1883, Geol. Surv. of Illinois, Vol. VII, page 326. 



Shell oblong, height from beak to the ventral margin about 

 equal to half the length, valves moderately convex on the an- 

 terior portion of the shell, and depressed towards the posterior 

 extremity, where the valves were apparently closely joined. 

 Beaks rather large, depressed, and incurved beyond the dorsal 

 margin, and situated about two-fifths the distance from the an- 

 terior to the posterior extremities. A broad and slightly flat- 

 tened depression appears on some of the specimens, extending 

 from the beak to the ventral margin of the shell. 



Dorsal margin nearly straight, ventral margin parallel with 

 the dorsal for about two-thirds of its length, curving abruptly 

 upward on the anterior and more gently on the posterior ex- 

 tremity. Lunule ovate; surface markings unknown. 



Length of an average size specimen 2% inches; height 1% 

 inches; thickness 15 / 16 inch. 



All the specimens obtained are casts in limestone. 



Position and locality. Chester limestone, upper bed at Chester, 

 Illinois. 



Collector, A. H. Worthen. 



No. 2491 of the Illinois State Museum. 



