Dai-L. — MoUusca and Brachiopoda. 



PLATE 18. 



Protocardia jMtiamensis Dall ; Ion. 13.5 mm. ; p. 415. 



Poromya perla Dall, side view ; alt. 9.0 mm. ; p. 428. 



Nucula chrysocoma Dall ; Ion. 5.0 mm. ; p. 370. 



The same, dorsal view, showing prodissoconcli. 



Poromya perla Dall, profile of left valve from in front ; alt. 9.0 mm. ; 



p. 428. 

 Malletia {Neilo) goniura Dall ; Ion. 13.0 mm. ; p. 386. 

 Limopsis diazi Dall, view of interior ; Ion. 4.5 mm. ; the crenulation of 



the margin was indistinct on this specimen ; p. 397. 

 Limopsis juarezi DM, exterior; Ion. 0.2 mm. ; p. 396. 

 Area (Bathyarca) nurleator Dall; Ion. 6.0 mm. ; p. 397. 

 Cetoconcha smithii Dall, profile ; Ion. 18.5 mm ; p. 431. 

 Nucula savatieri Mabille & Rochebrune ; Ion. 14.0 mm.; p. 367. 

 Lyonsia panamensis Dall ; Ion. 12.0 mm. ; p. 427. 



Vesicomya lepta Dall, interior of right valve ; Ion. 15.0 mm. (young 

 specimen) ; p. 416. 

 Fig. 14. E.xternal view of the same valve, about natural size for the adult. 



Figures 13 and 14 were drawn by the late Dr. J. C. McConnell, the others by 

 Miss Evelyn Mitchell. 



