572 PALEONTOLOGY OF ILLINOIS. 



Genus TEKEBKATULA, Llhwyd. 



TEREBRATULA BOVIDENS, Morton. 



PL 25, Tig. 15. 



Terebratula bovidens, MOKTON, 1830. Am. Jour. Sci., Vol. XXIX, p. 150. 



I. genieulosa, MCCHESXEY, 1861. Descr. New. Pal. Foes., p. 82. Also, 1865 illustrations of same; 

 pi. 1, fig. 2, a, b, c. 



Position and locality Upper and lower Coal Measures of Illinois. 



Genus PISCINA, Lamark, 1819. 



DISCINA NITIDA, Phillips sp? 



PI. 25, Fig. 1. 



Orbicvla niiida, PHILIIFS. Geol. of York, Vol. II, p. 221 ; pi. 11 ; figs. 10-13. 

 Syn. Discina Minsourienais, SHUMARD. Trans. St. Louis Acad. Sci., 1860, p. 221. 



Specimens of this shell sent to Prof. DAVIDSON were pronounced by 

 him identical with the European form known as D. nitida. 



Position and locality Common throughout the Coal Measures of Illi- 

 nois. 



Genus LING^LA, Bruguiere, 1789. 



LINGULA MYTILOIDES, Sowerby? 



PI. 25. Fig. 2. 



Lingula mytiloides, SOWERBY. Min. Con., Tab. XIX ; figs. 1 and 2, 1813. 



Compare L. umbonata, Cox. Geol. Survey of Kentucky, Vol. Ill, p. 576 ; pi. 10, fig. 4. 



Position and locality Common throughout the Coal Measures of Illi- 

 nois. 



SPIRIFER FULTONENSIS, Worthen Ms. 



PI. 25, Fig. 5. 



SHELL rather small, transversely oval, valves nearly 

 equal in convexity, with a wide cardinal area restricted 

 entirely to the ventral valve, and divided by a triangular 

 fissure. Hinge line equal to the greatest width of the shell, 



