OOM IV. 



BRACKLESHAM SEPTAKIUM. 



407 



on the right hand of the observer, and may readily be iden- 

 tified by the annexed Lign. 81. 



The fossil, Lign. 81, fig. 2, is a polished slice of indu- 

 rated argillaceous limestone, from the tertiary strata at 



LIGX. 81. SEPTARIUM WITH TURRITELLX; FROM BRACKLESHAM, SUSSEX. 



Fig. 1. TURRITELLA IMBRICATA; the perfect shell. 



2. A polished slab of the Septarium. 

 3. A cast of one of the shells, in calcareous spar. 

 (not. tize.) 



Bracklesham Bay, Sussex, and is part of a septarium abound- 

 ing in spiral univalves (Turritellce). Fig. 1 represents a 

 sheD, extracted from soft clay; and fig. 3, a cast in calca- 

 reous spar, from the septarium. In the polished slab, fig. 2, 

 sections of numerous shells are seen. The dark partitions, 

 or septa, are veins of spar, which occupy interstices that 



