panamic-pacific pelecypoda 525 



Explanation op Plate 52 



Figure Page 



1-lb. Notochlone columblensis (Sowerby) 303 



Fig. 1, length 50 mm. Bucaro, Panama. P'RI 25762; Fig. la, dorsal 

 aspect, length 37.8 mm. Manta, Ecuador, PRI 25763; Fig. lb, length 

 48.3 mm. San Carlos, Panama. PRI 25695a. 



2-2a. Nioche (Nioclie) mcglntyi, new species 309 



Length 31.3 mm. Palo Seco, Panama Canal Zone. Holotype, ANSP. 



3. Chionapsls purpnrissata (Dall) 301 



Length 50 mm. Punta Blanca, Ecuador. PRI 25764. 



4-4c. Chionopsis piillcaria (Broderip) 302 



Fig. 4, length 51 mm.; Fig. 4a, length 38 mm.; Fig. 4b, length 47 mm.; 

 Fig. 4c, length 48 mm. Viveros Island, Pearl Islands, Panama. PRI 

 25765. 



5-5a. Chionopsis pulicaria (Broderip) 302 



Largest specimen, length 46.4 mm. West Colombia. Types, British 

 Museum (Nat. History). 



