panamic-pacific pelecypoda 539 



Explanation of Plate 66 



Figure Page 



1-la. Semele vennsta. (Reeve) 370 



Natural and whitened, length 30.7 mm. Palo Seco, Panama Canal 

 Zone. Coll. S. Jadis. PRI 25838. 



2. Semele craneana Hertlein and Strong 360 



Copied after Hertlein and Strong, length 38 mm. Gulf of California. 



3. Semele margarita, new species 370 



Length 14.1 mm. Pearl Islands, Panama. Holotype, PRI 25935. 



4. Cnmingia mutica Sowerby 372 



Length 28.2 mm. Callao, Peru. P'RI 25839. 



5. Leptomja ecuadoriana Soot-Ryen 374 



Length 33 mm. Tumbez, Peru. PRI 25840. 



6. Semele guaymasensis Pilsbry and Lowe 369 



Length 27.4 mm. Palo Seco, Panama Canal Zone. PRI 25841. 



7. Semele sparsilineata Dall 363 



Length 35.7 mm. Manta, Ecuador. PRI 25842. 



8. Semele pallida (Sowerby) 364 



Length 25.6 mm. Esmeraldas, Ecuador. PRI 25843. 



9. Semele lentJculare (Sowerby) 363 



(bicolor C. B. Adams). Fig. 9, length 17 mm.; Fig. 9a, a section 

 of surface magnified. Manta, Ecuador. PRI 25844. 



10-lOa. Cumingia lamellosa Sowerby 371 



Fig. 10, length 21 mm.; Fig. 10a, length 23 mm. Negritos, Peru. 

 P'RI 25845. 



11. Semelina subqnadrata (Carpenter) 375 



Length 5.4 mm. Concepcion Beach near Poicri, Panama. PRI 25846. 



12. Semele joris (Reeve) 367 



White shell with rose-colored umbone, length 66.7 mm. Sonora, 

 Mexico. Coll. H. N. Lowe. ANSP 167998. 



