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 locality : In the upper layers of the Upper Green Marls, 

 at Shark River, Farmingdale, and Squankum, New Jersey. 



Caeicella pondbeosa, n. sp. 

 Plate XXIX, 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, mai-ked 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 



