NORTH-CAROLINA GEOLOGICAL SURVEY. 



209 



the other. 



voluted part, though it is thickened at 

 one end of it. It is more or less wrink 

 led transversely. In other respects it 

 is rather discoidal. 



Figure 30, it differs in form from all 

 the proceeding. It is conical, and 

 acute at one extremity and obtuse at 

 From the obtuse extremity, it sends off a short 

 process at right angles, and is probably the point 

 by which it is attached to the interior of the tym 

 panic cavity. 



But one of the most extraordinary of the ear- 

 bones of this formation, is represented by figure 

 Si. It consists of two parts, a short obtuse conical 

 portion, and a long process extending at right an 

 gles from it. It is over seven inches long. The 

 process referred to is four, measured from the 

 base of the heavy conical part, and it extends half way across 



FIG. 81. 



FIG. 30. 



it, so that its whole length is about 5 inches. The height of 

 the conical part is 3 inches. This is flattened, and its greater 

 circumference is 8 inches. The arm or process is irregularly 

 triangular, being hollowed out on two sides and flattened on 

 the other. The whole form, however, is difficult to represent 

 by means of a single figure. The figure is one-half the size 

 of the original. 

 15 



