EXPLANATION OF PLATE 31 

 All figures natural size. 

 Fig. 1. Mulinia densata Conrad. Etchegoin, Pliocene. 

 Fig. 2. Mulinia densa ta Conrad. Etchegoin, Pliocene. 

 Fig. 3. Mulinia densata Conrad. San Pablo, Miocene. 

 Fig. 4. Mulinia densata Conrad. Etchegoin, Pliocene. 

 Fig. 5. Mulinia densata Conrad. Etchegoin, Pliocene. 

 Fig. 6. Mulinia densata Conrad. Etchegoin, Pliocene. 



[352] 



