270 PALEONTOLOGY OF NEW JERSEY. 



ing about a fourth of an inch between the whorls. The tube in its present 

 condition is greatly compressed vertically, so that the height is only about 

 two-thirds as great as the transverse diameter, and the back shows a decided 

 crushing of the tube in the sharply angular dorsal crest of the specimen, 

 which was undoubtedly rounded in its normal condition. The surface of 

 the cast is marked by transverse undulations or ridges, which are rather 

 sharply cm-ved backward on the upper surface in their passage from the 

 umbilical edge to the outer one, and less strongly curved forward on the 

 under side of the volution. Near the position of the center of the outer 

 surface of the volution there has apparently been a line of rounded nodes 

 situated on the ridges, but not, however, on each one, and another series of 

 nodes at about one-third of the width of the volution within the edge on 

 the under side. At this inner line of nodes almost every second and third 

 ridge unites, forming a single ridge from that point to the umbilical cavity, 

 within which they appear to become obsolete. 



A second specimen, also a very much flattened cast of what seems to 

 have been the deflected outer part of the tube, has lost the nodes, and also 

 to a very great extent the bifurcation of the costse, as on this part of the 

 shell they form more regular encircling ridges, as the straightening of 

 the tube relieves the crowding at the umbilical edge. A third specimen, 

 quite lately obtained, consisting of the outer chamber and the deflected part 

 of the tube, shows this part to have been suddenly bent obliquely down- 

 ward to a length of 2^ inches, when it is abruptly bent upward again in 

 the same plane and nearly upon itself, so that the extremity of the tube, 

 or aperture, must have been nearly under the umbilical portion of the older 

 shell. The tube of this specimen is nearly circular, being a trifle higher 

 than wide, the ridges are strong and distinct, and the two lines of nodes 

 more easily observed; although owing to the deflection of the tube and its 

 irregular growth the bifurcations take place quite irregularly and the nodes 

 are also quite hregularly scattered, but always on the outer surface of the 

 tube. 



Septa comparatively unknown. The last one shows imperfectly on 

 the last specimen mentioned. There is apparently a rather large siphonal 

 lobe with a strong branch on each side of the rather large siphon, which is 



