panamic-pacific pelecypoda 557 



Explanation op Plate 84 



Figure Page 



1. ChJone (ChJone) compta (Broderip) 294 



Inside of a right valve showing the very small pallial sinus. Same 

 specimen as PI. 41, fig. 4. Bayovar, Peru. PRI 25693. 



2. Chionopsis amathusia (Philippi) 299 



Inside of a right valve showing the large and well defined pallial 

 sinus. Same specimen as PI. 41. fig. 7. Panama Bay. P'RI 25696. 



3-3a. Cyrenoidea panamensis Pilsbry and Zetek 228 



Length 19.1 mm. Near Panama City. Coll. J. Zetek. ANSP' 130415. 



4. Cooperella subdiaphana (Carpenter) 318 



Length 13.6 mm. San Pedro, California. PRI 25935. 



5. Cooperella panamensis, new species 318 



Length 10.3 mm. Guanico, Panama. Holotype, ANSP 218964. 



6. Moerella (Moerella) hiberna (Hanley) 404 



Length 18.2 mm. Zorritos, Peru. PRI 25936. 



7-7a. Entodesma (Agriodesma) picta (Sowerby) 468 



Length 23.5 mm. Peru. ANSP 55366. 



8-8a. 3Iytilopsis trautwineana Tryon 140 



Height 21.4 mm. Rio Cayapas, Ecuador. P'RI 25937. 



9-9a. Mytilopsis zetekl Hertlein and Hanna 141 



Fig. 9, height 9 mm.; Fig. 9a, height 6.7 mm. Venado Beach, Panama 

 Canal Zone. PRI 25938. 



10-lOa. Auadara (Diluvarca) labiosa (Sowerby) 90 



Length 56.4 mm. Holotype, British Museum (Nat. History). 



