112 PALEONTOLOGY OF NEW JERSEY. 
Family CANCELLARIDA4. 
Genus CANCELLARIA Lamarck. 
CANCELLARIa ALTERNATA. 
Plate xx, figs. 5-10. 
Cancellaria alternata Conrad: Jour. Acad. Nat. Sci. Phila., vol. 7, p. 155; Am. Jour, 
Conch., vol. 2, p. 67, Pl. Iv, fig. 7; Proc. Acad. Nat. Sci. Phila., 1862, p. 567; 
Meek, Check List Miocene Foss., p. 17. 
Cancellaria sp.? Heilprin: Proc. Acad. Nat Sci. Phila., 1887, p. 404. 
‘“Whorls six, rounded, with nine or ten prominent ribs, and prominent 
revolving distant strize 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 accompanied 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 correspondence is so great 
that I can not hesitate in considering it the same as the Maryland speci- 
mens. Those now under 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 distinetly 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 
strie, 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. 
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