304 SYSTEMATIC PALEONTOLOGY 



OPHILETA LEVATA Vanuxem 

 Plate XXXI, Figs. 18, 19 



OpMleta levata Vanuxem, 1842, Nat. Hist. New York, Geol., vol. iii, p. 36, 



fig. 1. 



OpMleta levata Cleland, 1903, Bull. Amer. Pal., vol. iv, p. 16. 

 OpMleta discus Cleland, 1900, Bull. Amer. Pal., vol. iii, p. 124 (252), pi. xv, 



figs. 5, 6. 



Description. Shell discoidal, 10 mm. or less in diameter, consisting 

 of four or more whorls rising into a slightly elevated spire, and concave 

 on the lower side where the umbilicus is wide and shows all of the whorls. 

 Margin of whorls sharp and somewhat elevated ; upper side of whorl flat, 

 lower side rounded. 



The identification of the specimens here referred to Ophileta levata 

 is due to Cleland who by a comparison of type specimens of each has 

 shown that his Ophileta discus and Vanuxem's 0. levata are based on the 

 same species. As in the case of Ophileta complanata, Vanuxem's descrip- 

 tion and figure of 0. levata are of little value. 



Occurrence. BEEKMANTOWN LIMESTONE (Stonehenge member). 

 Vicinity of Hagerstown and Funkstown, Maryland. 



Abundant in the Tribes Hill limestone of the Canadian at Canajoharie, 

 Tribes Hill, Fort Hunter and other localities in the Mohawk Valley of 

 New York. 



Collection. U. S. National Museum. 



Plate XXXIII, Figs. 1-3 ; Plate XXXIV, Fig. 2 



OpMleta compacta Salter, 1859, Quart. Jour. Geol. Soc. London, vol. xv, 



p. 378, pi. xiii, fig. 12. 

 OpMleta complanata Whitfield, 1889, Bull. Amer. Mus. Nat. Hist., vol. ii, 



p. 48, pi. vii, figs. 18-25. 



Description. Shells discoidal, coiled in the same plane ; flat or slightly 

 concave below, more concave above. Periphery flattened obliquely, the 

 lower edge of the volution being the largest, and rounded to the base, 

 while the upper angle is sharply carinate. Upper surface of each volution 



