287 



Fig. 



Ortho- 



^ _ Fig. 221. Ortho- tig. -",-. iniito- 



FlG. 220. Orthoceras eriense, x 14. The ceirts subulatnm. A ceras exile. Portion 



living chamber and septa, and a basal specimen with of a specimen (after 



view, showing position of siphuncle (after crushed living cliam- Hall) 



HaU). ber (after Hall). 



