panamic-pacific pelecypoda 477 



Explanation of Plate 4 



Figure Page 



1. Area (Area) trnncata (Sowerby) 77 



Side, dorsal, and ventral views of the holotype, length 77.8 mm. 

 Galapagos Islands. British Museum (Nat. History), 



2-2d. Area (Area) paeifiea (Sowerby) 76 



Fig. 2, enlargement of hinge and card nal area; some specimen as 

 fig. 2a; Fig. 2a, inside view, length 65.3 mm. Funta Patllla, Panama 

 City, Panama. PRI 25518; Fig. 2b. external view, length 70 mm. 

 Manta, Ecuador. P"RI 25519; Figs. 2c, 2d, ventral and dorsal views 

 of the same specimen as fig. 2a. 



3-3b. Area (Area) mntabilis (Sowerby) 76 



All figures of the same specimen, length 27.8 mm. Rio Geones beach, 

 Panama. PRI 25523. 



4-4b. Barbatia (Cucullaearca) reereana (d'Orb'gny) 81 



Fig. 4, enlargement of hinge and cardinal area, length of hinge line 

 47 mm. Isla la Plata, Ecuador. PRI 25529; Fig. 4a, copy of Maury 

 and Sheldon's velataformis in Maury, 1922. Length of specimen 

 66 mm. Bucaro, Panama; 4b. Ipngth of a small specimen, 51.4 mm. 

 Isla la Plata, Ecuador. PRI 25521. 



5-5a. Calloarca alternata (Sowerby) 84 



Fig. 5, length 39.7 mm.; Fig. 5a, length 33 mm, Palo Seco, Panama 

 Canal Zone. PHI 25522. 



