540 axel a. olsson 



Explanation of Plate 67 



Figure Page 



1-lb. Psammothalia cognata (C. B. Adams) 417 



Fig. 1, enlargement of hinge; Fig. la, left valve, length 46 mm.; 

 Fig. lb right valve, length 50.3 mm. Tumbez, Peru PRI 25847. 



2-2d. Florimetis cognata (Pilsbry and Vanatta) 410 



Fig. 2, length 65 mm., Venado Beach, Panama Canal Zone. PRI 

 25484; Fig. 2b, a ventral view, length 61.1 mm., Punta Blanca, 

 Ecuador. PRI 25849; Figs. 2c, 2d, a right valve, length 62.3 mm., 

 Bahia Honda at El Lagartillo, Panama. FRI 25851. 



3-3a. Cnmingia lamellosa Sowerby 371 



Fig. 3, enlargement of hinge; F^g. 3a, same specimen, length 28.6 

 mm. San Pedro, California. PRI 25852. 



4. Psanunotreta graiidis (Hanley) 412 



Right valve, length 84.7 mm. Mompiche, Ecuador. PRI 25853. 



5. Leptomya ecuadorina Soot-Ryen 374 



Enlargement of the hinge of a left valve. 



6-6a. Cumingia adamsi Carpenter 372 



Fig. 6, a right valve, length 16.5 mm., Jaramijo, Ecuador. PRI 

 24854; Fig. 6a, a left valve, length 9.6 mm. Holotype, Panama 

 (C. B. Adams). MCZ 20373. 



