214 PALEONTOLOGY OF NEW JERSEY. 
nodes on the largest part of the volutions, but notably in the much greater 
strength of the spiral ridges which cover the entire surface of the body 
whorl in almost equal strength, which is not the case in that species. 
Formation and locality: In the upper layers of the Upper Green Mars 
at Shark River, New Jersey. I have not observed it from any other local- 
ity. Collections at Rutgers College and the Am. Mus. Nat. Hist. 
CANCELLARITD. 
Genus CANCELLARIA Lamarck. 
CANCELLARIA RUDIS, 0. Sp. 
Plate xxx11I, Figs. 1, 2. 
Shell of medium, or below a medium size, broadly biturbinate, of 
nearly equal proportion above and below the point of greatest diameter 
exclusive of the anterior beak. Whorls four in the cast, the apical volutions 
not represented, not having been filled with sediment, probably having been 
filled with calcareous deposit during life, as the cast appears to be perfect. 
Volutions sharply angular, the angulation being near the top of the prin- 
cipal one; aperture large, subtriangular, higher than wide, acute above and 
below; columella strong, no markings preserved on the cast, but an indica- 
tion in its breadth, as shown on the inner lip of the aperture, of that lip 
having been somewhat extended or perhaps having overlapped the colu- 
mella; volutions crossed by a few strong, angular, vertical folds, not more 
than six to the volution, but showing on the last one nearly to the base of 
the shell; surface of the shell marked by spiral lines with depressed spaces 
between them. 
This cast seems to belong to that section of the genus Cancellaria 
described under the name Trigonostoma by Blainville, in which the aperture 
is triangular, the volutions sharply angular, aud the folds of the columella 
obsolete. The umbilicus in this species is not as large as is commonly the 
case in this group. : 
Formation and locality: In the upper layer of the Upper Green Marls, 
at Shark River, New Jersey. Collection at Rutgers College. 
