EASTMAN : CARBONIFEROUS SHARKS. 



G7 



injured considerably by weathering and other destructive agencies. In 

 all, portions of about 20 fused teeth are preserved, but only four of this 

 number still remain in their entirety or nearly so. These occur near 

 the distal end, and have been utilized for the construction of the adjoin- 

 ing text-figures nos. 3 and 4, which may be instructively compared with 

 Karpinsky's text-figures nos. 23-34, or with Dr. Henry Woodward's 

 illustrations of C. davisii. The teeth are much laterally compressed, 

 closely apposed, and their lower portions are curved forward in such 

 manner as to override one an- 

 other. The latter character 

 is more pronounced than in 

 Campodus, less so than in 

 Edestus and other species of 

 Campyloprion. That the an- 

 gulation dr curvature of the 

 teeth is toward the front in- 

 stead of posteriorly, is demon- 

 strated from the arrangement 

 known to obtain in Campodus 

 and Helicoprion. A forward 

 inflection is attributable to 

 Campyloprion davisii and C. 

 lecontei, where the smallest 

 teeth of the series are un- 

 questionably the oldest ; and 

 it is unlikely that the seg- 

 ments of C. annectans were 

 reflected in the contrary direction. 



The whole of the lateral surface of the crown appears to have been 

 covered with enamel, but this has been removed in most places subse- 

 quent to fossilization. In like marnier the curiously curved patches of 

 dentine occurring along the sides of the principal series toward the base 

 have been largely denuded of their enamelled coating. Some of the 

 symphysial teeth are worn, especially toward the proximal (posterior) end, 

 but hardly to such an extent as to suggest attrition against mutually 

 interlocking series of the opposite jaw. The coronal outlines are every- 

 where smooth and regular, except along the apical margin, which appears 

 to have been coarsely serrated. This serration is best indicated on the 

 opposite side of the series from that shown in the photograph, and is 

 repi'esented somewhat diagrammatically in text-figure 3. Making due 



Fig. 3. 



Campyloprion annectans Eastm. Lateral aspect 

 of four of the anterior symphysial teeth, 

 their serrated apices partly restored. X |. 



