PANAMIC-PACIFIC PELECYPODA 479 



Explanation of Plate 6 



Figure Page 



1-lb. Fulgeria illota (Sowerby) 83 



Figs 1, la, length 31.2 mm., Amador Beach, Panama Canal Zone. 

 PRI 25525; fig. lb. with periostracum, length 30.2 mm, Jaramijo, 

 Ecuador, PRI 25526. 



2-2d. Area (Area) mntabilis (Sowerby) 76 



Figs. 2, 2a, length 22.5 mm., Esmeraldas, Ecuador. PRI 25527; Figs. 

 2b-2d, length 23.3 mm., Santa Elena, Ecuador. PHl 25528. 



3-3b. Arcopsis solida (Sowerby) 85 



Fig. 3, enlargement of hinge; Figs. 3a, 3b, same shell, length 15.8 mm. 

 La Funtilla, Santa Elena, Ecuador. PRI 25529. 



4. Barbatia (Barbatia) lurida (Sowerby) 80 



Figure copied after Helen Rost, 1955, length 28.7 mm. Espiritu Santo, 

 Gulf of California. 



5. Barbatia (Barbatia) caneellaria (Lamarck) SI 



Enlargement of hinge and cardinal area, the grooves of the ligament 

 developed mainly on the posterior side of beak. Florida. 



6-6b. Aear gradata (Broderip and Sowerby) 82 



Figs. 6, 6a, length 25.6 mm.; Fig. 6b, length 33.2 mm. Palo Seco, 

 P'anama Canal Zone. PRI 25530. 



7-7b. Anadara (Diluvarca) adamsi, new species 90 



Three view of the same specimen, length 23 mm. Palo Seco, Panama 

 Canal Zone. Holotype, ANSP' 218917. 



