MOLLUSCA. 793 



sharp ridges between, which produce aspirate nodes by their 

 intersection; ii or 12 of the longitudinal ridges may be 

 counted on the inner half of the last volution and six of the 

 spiral ridges above the top of the aperture. The upper two- or 

 three volutions appear tO' have been smooth, or nearly so, as 

 originally described." (Whitfield.) 



Columella marked by two well-defined revolving folds below 

 the mid-height of the aperture. 



Remarks. — This is one of the very characteristic species of 

 the Woodbury clay, although a single individual has been found 

 in the Merchantville clay. It is a rather common species at 

 Lorillard, but like so many of the members of the fauna at this 

 locality, it grows tO' a larger size than at Haddonfield, the locality 

 from which the species was originally described. Whitfield's 

 illustration of the type specimen is about twO' and one-half times 

 enlarged, the specimen itself being about 8.5 mm. in height. The 

 Lorillard specimens are frequently 12 mm. in height, and the 

 largest ones are nearly 20 mm. It is a beautiful little shell and is 

 always easily recognized by its reticulate surface markings, 

 which are usually preserved in great perfection in the moulds 

 of the exterior of the shell. 



Formation and locality. — Merchantville clay-marl, near Mat- 

 awan (loa); Woodbury clay, Lorillard (102), near Matawan 

 (103), Crosswicks (168), near Haddonfield (164, 183). 



Geographic distribution. — New Jersey. 



Cancellaria smocki n. sp. 



Plate XCVIIL, Figs. 2-3. 



Description. — Shell with about three volutions in the cast ; the 

 dimensions of two of the type specimens are: height, 18.5 mm. 

 and 15.5 mm.; maximum diameter, 12 mm. and 10 mm.; height 

 of aperture, 12 mm. and 9.5 mm. The upper surface of the 

 volutions is nearly horizontal adjacent to the suture, but the 

 sides round rapidly downward becoming nearly parallel with 

 the axis of the shell at about one-fourth the distance from the 

 suture to the anterior margin of the outer volution, from this 



