ELASMOBRANCHII. 



69 



Fig. 31. — Galeocerdo aduncus Agassiz. 1-3, Monmouth Co. (Cleburne) ; 

 4-5, Monmouth Co. (Abbott) ; 6, Monmouth Co. (Knieskern) ; 7, Deal 

 (Powell); 8-10, Burlington Co. (Conrad); 11-15, Vincentown (Bryan); 

 16-18, Allowaystown (Yarrow). 



record the geologic formations are inferred to be the Navesink- 

 Hornerstown marl, the Manasquan marl and the Kirkwood clay 

 (Shark River Miocene) K.] 



Galeocerdo contortus Gibbes. 



Teeth robust, well elevated, little compressed. Coronal sur- 

 face well convex, high, and sharply pointed. Inner coronal sur- 

 face, though evenly convex, scarcely more so than outer, which 



Fig. 32. — Galeocerdo contortus Gibbes. 1, Monmouth Co. (Abbott) ; 2, 

 Monmouth Co. (Cleburne) ; 3, Monmouth Co. (Knieskern) ; 4-6, Burlington 

 Co. (Conrad) ; 7-9, Vincentown (Bryan) ; 10-11, Allowaystown (Yarrow). 



is more or less flattened basally. Apex elongated, slender or 

 attenuated, usually well twisted, and deflected laterally. Longer 



