/ 



• Thracia myopsis 



* Thracia septentrionalts 

 ■ Thraciidae 



Thyasira elliptica 



Figure 107. — Geographic distribution of Thracia myopsis, Thracia septenlriona- 

 lis, and Thraciidae. 



Figure 108. — Geographic distribution of Thyasira brevis, Thyasira croulinensis, 

 and Thyasira elliptica. 



121 



