PANAMIC-PACIFIC PELECYPODA 547 



Explanation of Plate 74 



Figure Page 



1-la. Psammotreta asthenodou (Pilsbry and Lowe) 413 



Fig. 1, length 68.1 mm., Puerto Chame, Panama. PRI 25895; Fig. 

 la, length 49.7 mm., Tumbez, Peru. PRI 25896. 



2. Psammotreta dombei (Hanley) 412 



Length 61.1 mm. El Lagartillo, Panama. PRI 25897. 



3-3b. Psammacoma lamproleuca (Pilsbry and Lowe) 414 



Fig. 3, length of a left valve, 84 mm., Bucaro, Panama. PRI 

 25898A; Fig. 3a, a right valve, length 87.1 mm., Pedernales, 

 Ecuador. PRI 25898B; Fig. 3b, a left valve, length 88.3 mm.. Sua, 

 Ecuador. PRI 25898C. 



4-4a. Psammotreta gubeniacula (Hanley) 413 



Length 46.9 mm. Palo Seco, Panama Canal Zone. PRI 25899. 



5-5a. Ardeamya columbieiisis (Hanley) 418 



Fig. 5, a right valve, length 60.3 mm.; Fig. 5a, interior of a left 

 valve, length 56.8 mm. Tumbez, Peru. PRI 25900. 



6-6a. Psammotreta aurora (Hanley) 411 



Fig. 6, left valve, length 44.4 mm.; Fig. 6a, right valve, length 

 41.1 mm. Palo Seco, Panama Canal Zone. PRI 25901. 



7. Psammacoma elytrum Keen 415 



Right valve, length 46.4 mm. Cojimenes, Ecuador. PRI 25902. 



8-8a. Psammotreta sp 411 



Fig. 8, left valve, length 31 mm.; Fig. 8a, right valve, length 

 27.7 mm. San Miguel, Rey Island. Pearl Islands, Panama. PRI 

 25903. 



9-9a. Psammacoma siliqna (C. B. Adams) 415 



Fig. 9, left valve, length 19.1 mm.; Fig. 9a, length 18.7 mm. 

 Venado Beach, Panama Canal Zone. P'RI 25904. 



