PANAMIC-PACIFIC PELECYPODA 523 



Explanation of Plate 50 



Figure Page 



1-lb. Nioche (Antiiiioche) belli, new species 310 



Figs. 1, enlargement of hinge; Fig. la, lb, external and dorsal 

 aspects, length 44.7 mm. Pedro Gonzalez Id., Pearl Islands, Panama. 

 Coll. Mr. L. Beil. Holotype, ANSP 218904. 



2. Antigona (Ventricolaria) isocardia (Verrill) 292 



Length 65 mm. Isla la Plata, Ecuador. PRI 25753. 



3-3b. Periglypta multicostata (Sowerby) 293 



Figs. 3, 3a, hinge and external view, length 110 mm. Pedro Gonzalez 

 Id., Pearl Islands, Panama. Coll. Mr. L. Beil. PRI 25754; Fig. 3b, a 

 small shell, length 47.7 mm. Taboga Id., Panama. PRI 25755. 



4. Nioche (Antinioclie) belli, new species 310 



Length 41.3 mm. Esmeraldas, Ecuador. PRI 25756. 



5-5a. Clementia (Egesta) solida Dall 265 



Hinge and external view, length 69 mm. Federnales, Ecuador. PRI 

 25757. 



