panamic-pacific pelecypoda 519 



Explanation of Plate 46 



Figure Page 



1-lc. Macrocallista (Mef?apitaria) aurantiaca (Sowerby) 273 



Fig. 1, enlargement of hinge; Fig. la, exterior of a left valve, length 

 83.7 mm.; Fig. lb, dorsal aspect, note surface markings on beaks 

 and umbones, length 37 mm.; Fig. Ic, a small shell with zigzag 

 lines, length 28.2 mm. Manta, Ecuador. PRI 25724. 



2-2c. Macrocallista (JIacrocallista) squalida (Sowerby) 273 



Fig. 2, enlargement of hinge; Fig. 2a, dorsal aspect, length 40 mm.; 

 Fig. 2b, length 79.6 mm. Pearl Islands, Panama. PRI 25725; Fig. 

 2c, small specimen which shows strong color pattern, length 50 

 mm. Santa Elena, Ecuador. PRI 25726. 



3. Transenuella panuosa (Sowerby) 281 



Length 39.2 mm. Bahia Lagunillas, P'aracas Peninsula, Peru. PRI 



25727. 



4-4b. Transennella modesta (Sowerby) 280 



Fig. 4, length 22.5 mm.; Fig. 4a, length 21.2 mm.; Fig. 4b, length 20 

 mm, Bucaro, Panama. PRI 25728. 



