532 axel a. olsson 



Explanation of Plate 59 



Figure Fage 



1-ld. Donax asper Hanley 343 



Fig. 1, enlargement of hinge, small symbols signify.-n, nymphal 

 plate, -lig, external ligament.; Figs, la, Id, length 39 mm.; Fig. 

 lb, length 26 mm. Bucaro, Panama. PRI 25802; Fig. Ic, a large 

 shell, length 43.4 mm. Tumbez, Peru. PRI 25803. 



2-2b. Donax dentiferns Hanley 344 



Length 36 mm. Charapota, Ecuador. P'RI 25804. 



3-3a. Donax panamensis Philippi 339 



A medium-sized shell, length 25.4 mm. Concepcion beach, near 

 Poicri, Las Tablas, Panama. PRI 25805. 



4-4b. Donax (Machaerodonax) transTersus Sowerby 345 



Figs. 4, 4a, length 40.1 mm.. Fig. 4b, posterior end showing gap. 

 Punta Montanita, Ecuador. PRI 25806. 



5-5b. Donax (Amphichaena) ciilter Hanley 346 



Fig. 5, right valve, length 29.2 mm.. Fig. 5a, left valve, length 

 27 mm.. Fig. 5b, magnifield detail of surface. Acapulco, Mexico. 

 PRI 25807. 



