Figs. 12-14- Tragophylloceras loscombi (J. Sowerhy) 

 from Lyme Hegis. 



[12 ^-Development of sutiire (from L. F. Spath, op. cit. p. 341) : 13 = Series of 

 septal sections made from one septum, X 2 ; 14 = Section of the whorl 

 along the datum-plane of that septum, showing the positions of these 

 septal sections.] 



