panamic-pacific pelecypoda 551 



Explanation of Plate 78 



Figure Page 



1. External view of the right valve of a pholad showing the various 

 parts and the names and position of the accessory plates. After 

 Ruth Turner, 1954. 



2-2b. Bariiea (Anchomasa) subtruncata (Sowerby) 444 



Fig. 2, length 46.2 mm.; Fig. 2a, length 46.5 mm.; Fig. 2b, length 46.3 

 mm. Mouth of the Tumbez River, Peru. PRI 25923. 



2c. Bariiea (Anchomasa) subtrnncata (Sowerby) 444 



With animal showing the long siphons enclosed in a thick sheath. 

 After Ruth Turner, 1954. 



3-3b. Cyrtopleura (Cyrtopleura) cnici^er (Sowerby) 445 



Fig. 3, length 36 mm.; Fig. 3a, length 32.6 mm.; Fig. 3b, length 

 31.5 mm. Isla del Gallo, Colombia. PRI 25924. 



4-4a. Pholas (Thovana) chiloensis Molina 443 



Fig. 4, length 81.2 mm., Tumbez, Peru. PRI 25925A; Fig. 4a, length 

 98 mm., Jaramijo, Ecuador. PRI 25925B. 



5-5d. Parapholas acuminata (Sowerby) 447 



Figs. 5, 5b, copied after Sowerby, Thesaurus, vol. 2; Figs. 5a, 5c, 

 length 50 mm.; Fig. 5d, specimen with its calcareous tube, length 

 82 mm. Crucitas, Ecuador. PRI 25926. 



6. Hastasia melannra (Sowerby) 448 



Length 66 mm., Guanico, Panama. PRI 25927. 



