222 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
Saxicavidae. 
Saxicava antarctica Philippi. 
Pholadidae, 
Xylophaga mexicana Dall. 
Pholadidea (Penitella) minuscula Dall. 
Periplomatidae. 
Periploma carpenteri Dall. 
Anatinidae. 
Bushia panamensis Dall. 
Lyonsiidae. 
Lyonsia panamensis Dall. 
Verticordiidae. 
Verticordia perplicata Dall. 
Lyonsiella radiata Dall. 
Poromyacidae. 
Poromya perla Dall. 
Poromya (Dermatomya) mactroides Dall. 
Poromya (Dermatomya) equatorialis Dall. 
Poromya (Dermatomya) chilensis Dall. 
Cetoconcha smithii Dall. 
Cetoconcha scapha Dall. 
Cuspidariidae. 
Cuspidaria patagonica Smith. 
Cuspidaria panamensis Dall. 
Cuspidaria (Cardiomya) pseustes Dall. 
Cuspidaria (Cardiomya) planetica Dall. 
Cuspidaria (Luzonia) chilensis Dall. 
Myonera garretti Dall. 
