BRACHIOPODS. 105 



Terebratula rowleyi WORTHEN. 



Plate xli, fig. 23. 



Terebratula rowleyi Worthen, 1884: Illinois State Mus. Nat. Hist', Bui. 2, 



p. 23. 

 Terebratula rowleyi Worthen, 1890: Geol. Sur. Illinois, vol. VIII, p. 102, 



pi. xi, figs. 6a-b. 



A small flattened form, with extended beak. 

 Horizon and localities. Lower Carboniferous, Burlington 

 limestone : Louisiana. 



Terebratula bovidens MORTON. 



Terebratula booidens Morton, 1836: Am. Jour. Sci., vol. XXIX, p. 150. 

 Terebratula millepunctata Hall, 1856 : Pac. R. R. Sur., vol. Ill, p. 101, pi. 



ii, figs. 1 and 2. 



Terebratula bovidens Hall, 1858: Geology Iowa, vol. I, p. 711. 

 Terebratula geniculosa McChesney, 1861: Desc. Pal. Foss., p. 82. 

 Terebratula bovidens McChesney, 1867 : Trans. Chicago A cad. Sci., vol. I, 



p. 37, Pi. i, fig. 2. 

 Terebratula bovidens Meek, 1872: U. S. Geol. Sur. Nebraska, p. 187, pi. 



i,figs 7a-c ; pi. ii, fig. 4. 

 Dielasma bovidens White, 1875: Expl. and Sur. w. 100 Merid., Prelim. 



Rep. Invert. Foss., p. 21. 

 Terebratula bovidens White, 1875: U. S. Geog. Sur. w. 100 Merid., vol. 



IV, p. 144, pi. xi, figs. lOa-c. 



Shell of medium size, ovoid. Ventral valve strongly 

 arched, with the greatest convexity toward the apical portion; 

 beak rather prominent, closely incurved ; foramen elliptic ; 

 median sinus wide and quite shallow. Dorsal valve but 

 slightly convex longitudinally, moderately arcuate transversely ; 

 mesial fold scarcely noticeable. Surface glabrate, with a few 

 rather distinct concentric lines of growth, but under a magni- 

 fier exhibiting a punctate structure. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Terebratula parva SWALLOW 

 Terebratula parva Swallow 1863: Trans. St. Louis Acad. Sci., vol. II, p. 83. 



Shell very small, gibbous. Surface nearly smooth, or 

 marked by fine radiating lines 



Horizon and localities Lower Carboniferous, Keokuk 

 limestone : Keokuk ( Iowa ). 



