v.- .-.-.■ 



• Pleuromeris tridentata 



* Plicatula gibbosa 

 ■ Poromya sp. 





Figure 91. — Geographic distribution of Pleuromeris tridentata, Plicatula gibbosa, 

 and Poromya sp. 



Figure 92. — Geographic distribution of Portlandia fraterna, Portlandia frigida, 

 and Portlandia inconspicua. 



113 



