32 



tant than the longitudinal striae bending backwards on the 

 carina. At the crossing of the two sets of striae the 

 surface is slightly nodulose, in well preserved specimens. 



Length '125 to 75 of an inch or more. 



Locality. — Bloomington ; Spergen Hill. 



Bellerophox subl^evis.— Shell sub-globose, inflated on 

 the last volution ; aperture transverse, arcuate, expanded, 

 the lip thickened and much extended at the junction with 

 the volution ; umbilicus none ; dorsum carinated by a nar- 

 row slightly elevated carina; surface ornamented by fine, 

 regular striae which bend abruptly and deeply backwards 

 on the carina, denoting the depth of the emargination of 

 the lip ; striae sometimes irregular from interrupted growth. 



Length from *062 to '875 of an inch. 



Locality. — Spergen Hill and Bloomington, la. ; Alton, 111. 



CONULARIA, Miller. 



^/Conularia subulata. — Shell quadrangular, the four sides 

 nearly flat and converging at an angle of about 18° ; sur- 

 face marked with a distinct longitudinal groove on each 

 of the angles, and numerous regular, smooth, closely ar- 

 ranged, elevated, transverse striae, which pass a little 

 obliquely downwards towards the middle of each of the 

 sides, where they meet at a very obtuse angle. A single 

 sharp longitudinal line passes down the centre of each side, 

 without interrupting the transverse striae ; angles truncate 

 or rounded towards the apex. 



Length *50 of an inch. 



Locality. — Alton, 111. 



NAUTILUS, Breyn. 



Nautilus Clarkanus. — Shell sub-discoidal, flattened on 

 the dorsum, and angular at its lateral margin ; umbilicus 

 large, showing all the inner volutions ; volutions (number 

 unknown) rapidly diminishing, broader than high, not em- 



