Goniophora abbreviata Clarke 



Fig. I, 2 Sculpture casts of right valves 



Locality: Jaguariahyva, Sao Paulo, Brazil 



Palaeanatina erebus Clarke 



Fig. 3, 4, 5 Conjoined expanded valves 



Locality: Ponta Grossa, Brazil 



Cypricardella? olivieria Clarke 



F^ig. 6 Conjoined valves, natural size 

 7 The left valve, x 3 



Locality: Ponta Grossa, Brazil 



Sphenotus lagoensis Clarke 



Fig. 8 E^xpanded conjoined valves with the crescence ridge some- 

 what intensified by compression 

 9 A right valve 



Locality: Lago, state of Sao Paulo, Brazil 



Leptodomus capricornus Clarke 



Fig. 10 A right valve 



11 A left valve 



12 Enlargement of posterior slope 

 Locality: Ponta Grossa, Brazil 



178 



