Raymond : Gastropoda of the Chazy Formation. 187 



Description. 



Shell of four volutions, body whorl very large, spire low, whorl 

 angular, sloping gently from the suture to the periphery, then sharply 

 deflected and flattened below. The under side of the body whorl is 

 rounded and strongly convex. In the section of the body whorl the 

 inner and lower lips rounded, the upper lip straight from the suture to 

 the periphery and nearly straight for a short distance below it. The 

 surface is covered by rather coarse lines of growth, which cross the 

 upper side of the volutions diagonally and backward, turning forward 

 after crossing the carina. On the under surface of the whorl the 

 striae turn sharply backward. 



Locality. — These shells occur in the Aylmer Sandstone at the 

 Canadian Pacific Railroad cut east of Main Street, Aylmer, Canada. 

 Named for W. R. Billings, of Ottawa, an enthusiastic student of the 

 Chazy. The types are in the Yale University Museum. 



Lophospira rectistriata sp. nov. 

 (Plat*: XLIX, figures 3-6) 



Lophospira sababbreviata Raymond, 1906, Annals Carnegie Museum, 



Vol. Ill, p. 501 et seq. (not of d'Orbigny). 



This species, which the writer has previously listed under the name 

 Lophospira subabbreviata, differs considerably from the figure given by 

 Hall, and should bear a distinct name. 



Description. 



Shell of medium size, with four or five sharply angulated whorls, 

 the last of which is much larger than the next preceding, making up 

 more than half the height of the shell. The first two whorls are 

 rounded, the last two or three strongly angulated. On the body 

 whorl below the periphery is a low carina, which is separated from the 

 periphery by a concave space. On testiferous specimens the sutures 

 are not sharp, but in casts of the interior they are deep. The section 

 of the body whorl is rounded at the top, notched at the outer angle 

 of the main carina and rounded below. The umbilicus is small, often 

 covered by the inner lip. On the periphery of the body whorl is the 

 somewhat rounded and prominent slit band. 



The surface is marked by fine lines of growth, which run slightly 

 backward from the suture to the band on the upper keel ; below the 



