DESCRIPTION OF PLATE VII. 



PACE. 



Orthoceras ludlowense n. sp., 139 



Fig. 1, lateral view of ten chambers, also showing the arching 

 of the chambers; Fig. 2, an end view, showing the eccen- 

 tric position of the siphuncle. 



Gomphoceras indianense n. sp., 137 



Fig. 3, body chamber and ten septa; Fig. 5, outline of a 

 transverse section ; F'ig. 4, outline of the tenth septum and 

 position of siphuncle. 



