MOLLUSCA. 771 



Remarks. This species is known only from internal casts, 

 and, so far as known, is restricted to the fauna of the Nave- 

 sink marl. It differs from both T. alabamensis and T. inter- 

 media in its much more depressed spire. 



Formation and locality. Navesink marl, near Atlantic High- 

 lands (108), Crawfords Corner (i26 7 ), near Holmdel (127), 

 Crosswicks Creek (195). 



Geographic distribution. New Jersey. 



Turbinella subconica Gabb. 

 Plate XCL, Figs. 11-12. 



1860. { Tturbinella subconica Gabb, Proc. Acad. Nat. Sci. Phil. 



(1860), p. 94, pi. 2, fig. 6. 



1861. Turbinella subconica Gabb, Synop. Moll. Cret. Form., p. 



142 (86). 

 1864. Turbinella subconica Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 21. 



1868. Turbinella ? subconica Con., Cook's Geol. N. J., p. 730. 

 1892. Turbinella ? subconica Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 18), p. 81, pi. 9, figs. 7-8. 

 1905. Turbinella subconica Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 25. 



Description. "Shell rather below a medium size, the 

 cast measuring only about I inch in height, with a 

 transverse diameter somewhat less; form turbinate, with 

 a very low spire, consisting of not more than three 

 volutions in the only specimen known; volutions ventricose, 

 obconical, scarcely rounded on the upper margin, but rap- 

 idly narrowing below and rounded on the side; aperture large, 

 almost semilunate, or only very slightly convex on the inner mar- 

 gin ; columella strong, marked by two very distinct plications at 

 the lower third of the aperture, the lower one being distinctly the 

 stronger of the two^; sutures between the whorls of the cast very 

 large, indicating a thick, heavy shell ; surface as shown on the in- 

 side of the body whorl of the cast marked by strong spiral lines 



