112 PALEONTOLOGY OF NEW JERSEY. 



Family CANCEI.I.ARin^^. 

 Geuus GANCELLARIA Lainarck. 

 Cancellaria alternata. 

 Plate XX, figs. 5-10. 



Cancellaria alternata Conrad: Jour. Acad. Nat. Sci. Pbila., vol. 7, p. 155; Am. Jour. 



Conch., vol. 2, p. 67, IM. iv, fig. 7; Proc. Acad. Nat. Sci. Pbila., 1802, p. 5G7; 



Meek, Check List Miocene Foss., p. 17. 

 Cancellaria sp.? Heilpriu: Proc. Acad. Nat Sci. Phila., 1887, p. 401. 



"Whorls six, rounded, with nine or ten prominent ribs, and prominent 

 revolving distant striae and an intermediate fine line; spire conical; aperture 

 less than half the length of the shell, subovate; columella three-plaited, 

 plaits decreasing in size toward the base; umbilicus small; summits of volu- 

 tions flattened; five of the larger revolving lines on the penultimate whorl:" 

 (Conrad in Am. Jour. Conch.) 



The above description differs in no important feature from the original 

 one given in the first series of the Journal of the Academy of Natural 

 Sciences, but contains some additional features, and is accompaniefl by a 

 figure of the species. The shells from New Jersey, which I have identified 

 with it, are somewhat variable in form, and present some features not men- 

 tioned in either of the descriptions. Still the coiTespondence is so great 

 that I can not hesitate in considering it the same as the J\Iaryland speci- 

 mens. Those now iinder consideration vary much in their comparative 

 length, especially in the spire, and the shoulder of the volution is flattened 

 on some and on others is distinctly rounded. On some the vertical ribs are 

 thick, with narrow interspaces, and others have them narrow with broad 

 interspaces. Very many specimens show six or seven prominent spiral 

 striae, while others have only the five mentioned in the description. Most 

 of them show from four to six fine raised lines on the summit of the whorl, 

 a feature not mentioned in either description, and all have several other 

 lines below the prominent ones mentioned. The form of the aperture of 

 course varies with the proportional length of the shell. The species is a 

 very beautiful one and appears to have been very abundant, judging from 

 the proportionate number of them in the collection. 



