204 Annals of the Carnegie Museum. 



Locality. — In the Chazy Sandstone on the south end of Valcour 

 Island. The figured specimen is in the Carnegie Museum. 



Genus Eccyliopterus Remele. 



Eccyliopterus vagrans Raymond. 



(Plate XLIX, figures io, ii.) 



Helicotoma vagrans Raymond, 1905, American Journal of Science, 



Series 4, Vol. XX, p. 376. 



This small but characteristic shell occurs only rarely in the Chazy 

 and may readily be identified by the fact that the spire is depressed 

 below the general surface and there is a sharp ridge on the outer angle 

 of the body volution. 



Description. 



Shell small, the spire flat and depressed below the plane of the 

 highest points on the upper surface. Outer edge of the body whorl 

 angular, raised as a high sharp ridge on the body whorl. Lower 

 surface of shell rounded, the umbilicus very wide, disclosing all the 

 whorls. Section of the body whorl quadrilateral, angular above, 

 rounded below. Surface marked by fine lines of growth which turn 

 back on crossing the angle of the upper surface. This species is 

 related to Eccylioptetus beloitensis Ulrich and Scofield. 



Locality. — A rare fossil in the Chazy at Valcour Island, New York. 

 The types are in the Carnegie Museum. 



Genus Helicotoma Salter. 



Helicotoma whiteavesiana sp. nov. 



(Plate XLVlII, figures ii, 12.) 



In the Aylmer Limestone at Aylmer and at the Hog's Back, near 



Ottawa, Canada, there occur thousands of casts of a small species of 



Helicotonia. No specimens have been observed which retain any 



satisfactory surface markings. The shell consists of three flat-topped 



whorls which expand gradually from the apex. The spire is low and 



step-like. The lower portion of the body whorl is rounded, the 



umbilicus rather wide. The periphery of the last whorl has an 



elevated rounded ridge, beneath which is a slight concavity. One 



specimen (Plate XLVIII, figure 12) shows the outline of the outer 



lip. This species resembles Helicotoma verticalis Ulrich but differs 



