panamic-pacific pelecypoda 521 



Explanation of Plate 48 



Figure Page 



1-lb. LaJiielliconcha circinata altemata (Broderip) 286 



Fig. 1, length 44.7 mm. Santa Elena, Ecuador. PRI 25736; Fig. la, 

 length 44.2 mm.; Fig. lb, length 39.8 mm. Manta, Ecuador. P'RI 

 25737. 



2-2b. Lamelllconcha circinata yinacea, new subspecies 287 



Fig. 2, length 29.5 mm. Guanico, Panama. Faratype PRI 25744; Fig. 

 2a, length 31.3 mm. Santa Elena, Ecuador. Paratype, PRI 25745, 

 length 32.2 mm. Manta, Ecuador. Holotype, ANSP" 218920. 



3. Lamelliconelia circinata circinata (Born) 286 



Length 36 mm. Chiriqui Lagoon, Panama (Caribbean). PRI 25738 



4-4c. Lamelliconcha concinna (Sowerby) 287 



Fig. 4, length 35 mm.; Fig. 4a, length 29.3 mm.; Fig. 4b, length 26.4 

 mm.; Fig. 4c, length 31.5 mm. Santa Elena, Ecuador. PRI 2573f>. 



5-5a. Lamelliconcha tortuosa (Broderip) 288 



Fig. 5, length 35.5 mm. Tumbez, Peru. PRI 25746; Fig. 5a, length 

 37.8 mm. Puerto Chame, Chorrera, Panama. PRI 25740. 



6-6b. Lamelliconcha paytensis (d'Orbigny) 288 



Fig. 6, length 37.2 ram., Negritos, Peru. PRI 25741; Fig. 6a, length 

 35.2 mm., Tumbez, Peru PRI 25742; Fig. 6b, white form, length 

 39.8 mm., P'unta Montanita, Ecuador. PRI 25743. 



