MOLLUSCA. 789 



have preserved such features on the interior surface." (Whit- 

 field.) 



Remarks. This species may be easily distinguished from R. 

 nasutus by reason of its proportionally more elongate spire, 

 that portion of the shell usually being about one-half its total 

 length, while in R. nasutus the spire is much shorter than the 

 body volution. This species is usually much smaller than R. 

 nasutus, the specimen illustrated by Whitfield being one of the 

 largest examples seen. In the smaller shells the upper margin 

 of the volutions is usually not so square and shoulder-like as in 

 Whitfield's large individual, and the shell approaches Voluto- 

 denna intermedia in form, but it is always more slender than that 

 species, and. has four strong columellar folds. 



Formation and locality. Manasquan marl, near Farmingdale 

 (138), Squankum (Whitfield). 



Geographic distribution. New Jersey. 



Genus TURRICULA Klein. 



Turricula scalariformis Whitfield. 

 Plate XCVIL, Fig. 11. 



1892. Turricula scalariformis Whitf., Pal. N. J., vol. 2 

 (Monog. U. S. G. S., vol. 18), p. 95, pi. n, fig. 9. 



Description. "Shell greatly elongated, the spire being pro- 

 portionally slender and composed of numerous volutions, which 

 are moderately convex, and moderately increasing in height with 

 additional growth ; number unknown ; the specimen consists only 

 of a portion of the spire containing about five volutions, the 

 apex and body volution being absent; surface marked by strong 

 vertical folds which are separated by concave, equally wide de- 

 pressions, quite straight and ridged in their direction from su- 

 ture to suture, and. number about 1 6 to each volution ; folds 

 crossed by spiral lines, about eight of which can be counted on 

 the exposed part of the volutions, and raised and rounded on 

 the top." (Whitfield.) 



