266 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ^7 



Formation and locality. — Upper Cambrian: (77) Potsdam sand- 

 stone near the water below the falls at the high bridge, and also at 

 several horizons in the section, the highest point being 70-75 feet 

 (21.3-22.9 m.) above the water, in Ausable Chasm, Essex County, 

 New York. 



Genus PELAGIELLA Matthew 



Pelagiella Matthew, 1895, Trans. New York Acad. Sci., Vol. 14, p. 131. 



PELAGIELLA MINUTISSIMA (Walcott) 



Plate 41, figs. IS and 16 



Platyccras minutissimum Walcott, 1879, Thirty-second Ann. Rept. New 

 York State Museum, p. 129. (Original description as below.) 



Shell sinall, subspiral, regularly arcuate from near the aperture to 

 the apex, making nearly three-fourths of one volution ; section sub- 

 elliptical, somewhat carinate upon the dorsum. Two transverse de- 

 pressions upon the sides give a slight undulation to the body of the 

 shell. 



Surface marked by faint longitudinal striae. 



Formation and locality. — Upper Cambrian: (76) Arenaceous 

 Hoyt limestone at Hoyts quarry, 4 miles (6.4 km.) west of Saratoga 

 Springs, Saratoga County, New York. 



PELAGIELLA HOYTI (Walcott) 



Plate 41, fig. 17 



Platyccras hoyti Walcott, 1890, Proc. U. S. Nat. Mus., Vol. 13, p. 268, pi. 20, 

 fig. 8. (Original description as below.) 



Shell small, depressed, making about three volutions, the interior 

 below the plane of the outer volution. Volutions contiguous through- 

 out their extent, expanding gradually to the somewhat compressed, 

 more rapidly expanding outer whorl. Aperture unknown. 



Outer surface of shell marked by fine concentric striae and the inner 

 surface by longitudinal striae. 



This species differs from the associated P. minutissima in the form 

 of the whorls and surface characters. The longest specimen has a 

 transverse diameter of 4 mm. 



Formation and locality. — Upper Cambrian: (76) Arenaceous 

 Hoyt limestone at Hoyts quarry, 4 miles (6.4 km.) west of Saratoga 

 Springs, Saratoga County, New York. 



