MOLLUSCA. 787 



by smaller ridges between the large ones; the upper lines nearly 

 parallel to the suture, but below they become more and more 

 oblique, so that the lower ones become nearly parallel with the 

 columella ; aperture comparatively broad and the lip thin ; 

 columella marked by three or four very oblique folds, situated 

 near the middle of its length ; the upper three at equal distances 

 from each other and the lower one a little more distant from the 

 next above." (Whitfield.) 



Remarks. This is the common member of the genus in the 

 fauna of the Navesink marl .in New Jersey. The specimens are 

 almost always more or less fragmentary, so that the complete 

 form of the shell is rarely preserved. It is altogether probable 

 that the specimen described by Whitfield as a distinct species 

 under the name R. angulatus, is only a form of the more common 

 R. nasufais, and it is quite possible that both of them are the same 

 as R. texanus Conrad. 



Formation and locality. Merchantville clay-marl, Lenola 

 (163); Navesink marl, Middletown (ii3 2 ), near Crawfords 

 Corner (i26 7 ), near Holmdel (i28 5 , 127), Crosswicks Creek 

 (195), Freehold, Marlboro (Whitfield). 



Geographic distribution. New Jersey. 



Rostellites angulatus Whitfield. 

 Plate XCVIL, Figs. 3-4. 



1892. Rostellites angulatus Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 1 8), p. 88, pi. n, figs. 3-4. 

 1905. Rostellites angulatus Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 25. 



Description. "Shell moderately large and proportionally 

 slender, with an elevated spire, as shown by the cast, the only 

 condition in which it has been recognized ; body volution forming 

 the great bulk of the shell, and the aperture equaling more than 

 one-half of the entire length; volutions probably five or more, 

 flattened on their surfaces with abrupt scalariform sutures; last 

 volution flattened or obscurely concave below the suture for 



