232 



NORTH-CAKOLINA GEOLOGICAL SURVEY. 



Crown only slightly oblique, rather thick, but comparative- 

 ly narrow, but wide at base, and armed with serrated wing- 

 lets, pointing upwards and outwards ; the serratures are strong- 

 er than those upon the crown ; roots massive, and separated 

 by a distinct arch. Figure 58, a tooth which should probably 

 referred to this species, though the arch of the root is flatter. 



Prof. Gibbs, on the authority of Prof. Agassiz, has merged 

 in the carcharodon angustidens, the following species : C. lan- 

 ceolatus, 0. heterodon, C. megalotis, C. semi-serratus, C. au- 

 riculatus, C. turgidus, C. semi-serratus, and C. toliapicus, on 

 the ground that they are insufficiently characterized and not 

 clearly distinguishable from each other. 



CAECHAEODON TRTANGTJLARIS, N. S. (Fig. 59.) 



Crown of the tooth rather thin ; the posterior faces of the 

 crown meeting in the central line at an obtuse angle, but upon 



FIG. 59. 



** 



