288 PALEONTOLOGY OF NEW JERSEY. 
diameter from the ventral margin, as seen in the aperture of the large speci- 
men, but in a second smaller one is close against the back of the next inner 
volution. The septa bend downward to the siphon around it, forming a 
deep funnel-like depression, and unite with the tube about opposite the line 
of the sides of the next septum below, the sides of the siphonal tube con- 
tinuing in a direct line from septum to septum. Surface of the shell un- 
known, the examples all being internal casts only. 
I think there can be no question regarding the relations of this shell 
to the genus Aturia, as defined and understood by Bronn. It certainly is 
not congeneric with Pelagus Montfort, as typified in the figure given with 
the original description, as in that one the septa make not less than three of 
the abrupt flexures, and are much more like some of the Devonian forms 
of Goniatites than like Aturia. The peculiarity shown in the siphon of 
Aturia is apparently quite characteristic, and when seen, which is quite 
common in the New Jersey casts, can not be well mistaken. The entire 
central portion of the septum is gradually bent downward and forms a 
broad open funnel as seen when looking into the upper side of the septum, 
but rapidly decreases in size without angle, and passes within that of the 
septum below; in this respect being entirely different from Nautilus and all 
the allied genera. 
Formation and locality: In the Eocene Green Marls at Shark River, 
Farmingdale, near Squankum, and near Long Branch, New Jersey. The 
examples figured are from Shark River, New Jersey, and belong to the col- 
lections at Rutgers College. | 
