Fic. 
1. Propvcrus Ivers. 
Propuctus Ivestr. 
Propvucrus Ivesit. 
Propvucrvus Ivestt. 
Propuctvus Ivesir. 
Propucrus Iversit. 
Propvcrvs Ivesit. 
Propvuctvs Ivesit. 
bo 
. ‘ 
SPAR Pe 
EXPLANATION OF PLATE IL. 
Interior surface of dorsal valve ‘ 
Cast of exterior surface of dorsal valve 
Dorsal valve in place 
Ventral valve, posterior surface 
Ventral valve, cast of interior surface 
Ventral valve, anterior surface 
Ventral valve, lateral profile 
Spines from wing 
Propuctus occipenTaLis. Cardinal aspect of dorsal valve 
10. Propucros occrpentaLis. Lateral profile of dorsal valve 
11. SrreproRHyYNCus PYRAMIDALIS. Profile of ventral valve 
12. SrREPTORHYNCUS PYRAMIDALIS Veutral valve from above 
13. STREPTORHYNCUS PYRAMIDALIS. Ventral valve, cardinal aspect 
