206 PALEONTOLOGY OF NEW JERSEY. 
of preservation. The most marked difference between these casts and the 
Alabama specimens will be found in the shorter spire and in the proportion- 
ally larger upper part of the volution. It should be remembered, however, 
that these features are regularly and constantly increased with the increase 
in size of this and all closely allied forms. There are several other species 
of the Eocene formations that are closely related to this one, of which the 
casts would be scarcely, if at all, distinguishable from these, but I think a 
close comparison of both casts and the shells of these forms will prove the 
New Jersey and Alabama specimens identical. | 
Formation and locatity: In the upper layers of the Upper Green Marls, 
at Shark River, Farmingdale, and Squankum, New Jersey. 
CARICELLA PONDEROSA, D. SD. 
Plate xx1x, Figs. 7, 8. 
Shell rather large for the genus, and, so far as can be determined from 
the cast, has been thick and heavy. Form obovate or pyriform in outline, 
largest above, giving the greatest convexity near the upper part of the volu- 
tion, and becoming very attenuate in front to form the anterior beak and 
canal. Spire very short in the cast, being only very slightly convex or low 
dome-shaped. Volutions four or five probably in the shell, scarcely four 
in the cast; sutures strongly marked and the inner whorls scarcely rising 
above the outer ones. Aperture large, obtuse above and pointed below. 
Columella strong and heavy, marked by three very heavy folds which 
increase rapidly in size from above downward. Surface of the shell un- 
known. 
This species rather closely resembles C. pyruloides Conrad in general 
form, but has a shorter spire and a somewhat more clavate form, the great- 
est diameter of the volution being higher in proportion than in that one. 
The columella is also much stronger’and the folds entirely different in 
strength, and the entire shell much thicker. This latter character has 
been so marked as to give room for the shell to be perforated by some 
boring sponge, or similar body, over nearly the entire extent of the outer 
volution, and to transmit its markings to the cast. The entire length and 
