110 PALEONTOLOGY OF NEW JERSEY. 



Family COLUMBELLID^E. 



Genus AMYCLA H. and A. Adams. 



Amycla communis. 



Plate XIX, Figs. 12-15. 



AmycCa (Astyris) communis Conrad: Proc. Acad. Nat. Sci. Phila., 1862, p. 287 and p. 



564. 

 Columbella lunata (Say.) Tuomey and Holmes: Plioc. Foss. South Carolina. 

 Columbella communis (Con.) Heilprin: Proc. Acad. Nat. Sci. Phila., 1887, pp. 398 and 



403. 



"Small, whorls six or seven, smooth and polished; spire rather elevated; 

 body whorl abruptly rounded in the middle, or subangular; submargin of 

 labrum minutely dentate." (Com-ad.) 



The largest individual of this species which I have seen from New Jer- 

 sey is scarcely three-eighths of an inch long. It is a somewhat robust 

 shell, with the spire, above the aperture, once and a half as long as the 

 aperture itself. The volutions are but slightly convex between the sutures, 

 being flattened in the direction of the spire, the last one being quite angular 

 at the upper part of the ap ertnre. The outer lip is thickened and swollen 

 externally, and denticulate within when complete, some specimens showing 

 as many as eight ridges; the columella r lip is also sometimes slightly callous, 

 and often shows a small tubercular callus at the upper angle, while below 

 and on the beak portion of the last volution there are distinct spiral 

 impressed lines. General surface smooth and semipolished. Nucleus 

 slightly tubercular, although seldom seen. On quite a number of the 

 s|)ecimens color lines are distinctly observed. These are vertical, brownish 

 in color, narrow, with the intervening spaces about twice as wide as the 

 line, the line being continuous and vertical and but slightly wavy, and not 

 interrupted liy spiral bands as in C. Imtata Say, from which it differs Aery 

 materially in general form and in being nnich larger. 



Formation and locaidij: In the gray micaceous marls of the Miocene at 

 Shiloh and Jericho, N. J., and given by Tuomey and Holmes from South 

 Carolina. The specimens used are from the collections of the National 

 Museum. 



