302 SYSTEMATIC PALEONTOLOGY 



Occurrence. BEEKMANTOWN LIMESTONE (Turritoma zone). Stouf- 

 ferstown, Pennsylvania, and in exposures along the National Highway, 

 east of Huyett, Maryland. Beekmantown limestone of Canada. 



Collection. TJ. S. National Museum. 



ECCYLIOPTEEUS TEIANGULUS (Whitfield) 



Plate XXXIII, Figs. 6, 7 



Ecculiomphalus triangulus Whitfield, 1890, Bull. Amer. Mus. Nat. Hist., 



vol. iii, p. 29, pi. i, figs. 5-9. 

 Eccyliopterus triangulus Ulrich and Scofield, 1897, Geol. Minnesota, Pal., 



vol. iii, pt. 2, pi. Ixxiv, figs. 5, 6; pi. Ixii, fig. 73. 



Description. Shell less than two inches in diameter and consisting of 

 from one to one and a half volutions, loosely coiled and not in contact at 

 any point. Tube increasing rather rapidly in dimensions, triangular in 

 section, flattened on three-fourths of its upper surface and rapidly 

 rounded to the inner angle. Peripheral angle acute and the outer surface 

 sloping rapidly inward to the rounded basal angle. Shell substance very 

 thin, the surface characters unknown, except indistinct wavy lines cross- 

 ing the shell and receding toward the acute angle. The apical portion is 

 usually entirely filled with calcareous matter as the shell gets larger, thus 

 shortening the inner coil of the casts. 



Occurrence. BEEKMANTOWN LIMESTONE (Cryptozoon steeli zone). 

 Three-fourths mile east of Charlton, Maryland, and at the same horizon 

 in Pennsylvania. The types are from this formation in Vermont. 



Collection. U. S. National Museum. 



Genus OPHILETA Vanuxem 



OPHILETA COMPLANATA Vanuxem 



Plate XXXI, Figs. 2-5 



Ophileta complanata Vanuxem, 1842, Nat. Hist. New York, Geol., vol. iii, 



p. 36, fig. 2. 



Ophileta complanata Cleland, 1903, Bull. Amer. Pal., vol. iv, p. 15 (41). 

 Pleurotomaria hunterensis Cleland, 1900, Bull. Amer. Pal., vol. iii, p. 124 



(252), pi. xvii, figs. 1, 2, 7, 8. 

 Pleurotomaria Jiunterensis Cleland, 1903, Bull. Amer. Pal., vol. iv, p. 16, 



pi. iv, figs. 1, 2. 



