Tentaculites jaculus Clarke 



Fig. I A cluster of tubes with characteristic irregularity of an- 

 nulation. Natural size 

 Locality: Ponta Grossa, Brazil 



Tentaculites crotalinus Salter 



Fig. 2 A cluster of tubes, x 3 



Locality: Ponta Grossa, Brazil 



Tropidocyclus antarcticus Clarke 



Fig. 3 Tavo accidently conjoined individuals 



4 Dorsal view showing the character of the striae, x ij 

 Locality: Pebble island, West Falkland 



Plectonotus (Bucaniella) hapsideus Clarke 



Fig. 5 A laterally compressed individual showing the dorsal seam 

 6, 7 Two other similarly compressed shells 

 Locality: Ponta Grossa, Brazil 



Bellerophon quadrilobatus Salter? 



Fig. 8 An internal cast of a trilobed shell which may pertain to 

 this species 

 Locality: Pebble island, West Falkland 



Diaphorostoma allardycei Clarke 



Fig. 9, 10, II Three views of this species, indicating its form and 

 style of ornament 

 Locality: Pebble island, West Falkland 



Plectonotus (Bucaniella) dereimsi Knod 



Fig. 12, 13, 14 Views of more or less complete examples of these 

 shells 

 Locality: Ponta Grossa, Brazil 



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