244 NORTH-CAROLINA GEOLOGICAL SURVEY. 



rangement may be obtained by an inspection of the mouth 



of the mylliobates, the common sting ray of the 



FIG. 96. coas k j n this fish the teeth are set also in pavement, 



tbut they are not angular. But the teeth in the 

 Pycnodonts are not placed with so much regularity 

 as in the Myliobatides. 

 Fig. 96 is figure of a tooth belonging to the back 

 part of one of the middle rows of the pavement, or 

 mosaic. It may be called Pycnodus Carolinensis. 



The teeth of this species of fish occur in the miocene 

 associated with those belonging to the genera galeocerdo and 

 lamna. The family of pycnodonts began their career 

 97 ' in the Permian, but were the most numerous in the 

 Jurassic period. 



Another species of pycnodont is represented by its 

 tooth in fig. 97, which appears to be much less com- 

 mon than the preceding. 



SCALE OF A GANOID. (Fig. 98.) 



A single scale (fig. 98,) was found in the miocene upon the 

 Cape Fear. The fish was closely related to the gar-pike, (le- 



pidosteus,) of most of the Ame- 

 rican rivers. The scale occupied 

 a position in the first row of 

 scales back of the head. The 

 fish of this class had already be- 

 come rare at the commencement 

 of this epoch. The gar-pike is the only surviving one of this 

 family in the American waters. 



CLASS CYCLOIDEA. (Figs. 99, 100.) 



The annexed figures represent a pe- 



,/.-, , i , 

 culiar form ot nsn teeth, which are quite 



common in some of the marl beds in 

 Edgecombe county. They were attach- 

 ed by ligament, and probably occupied 

 a position in the throat. 



