Dau, — Mollusca and Brachiopoda. 
PLATE 18. 
Protocardia panamensis Dall; lon. 18.5 mm. ; p. 415. 
Poromya perla Dall, side view; alt. 9.0 mm. ; p. 428. 
Nucula chrysocoma Dall; lon. 5.0 mm. ; p. 870. 
'The same, dorsal view, showing prodissoconch. 
Poromya perla Dall, profile of left valve from in front; alt. 9.0 mm.; 
p. 428. 
Fra. 6. Malletia (Neilo) goniura Dall; lon. 13.0 mm. ; p. 386. : 
Fra. 7. Limopsis diazi Dall, view of interior; lon. 4.5 mm.; the crenulation of i 
the margin was indistinct on this specimen ; p. 397. 1 
Fic. 8. Limopsis juarezi Dall, exterior; lon. 6.2 mm. ; p. 396. 
Fie. 9. Arca (Bathyarca) nucleator Dall; lon. 6.0 mm.; p. 397. 
Fie. 10. Cetoconcha smithii Dall, profile ; lon. 18.5 mm ; p. 431. 
Fie. 11. Nucula savatieri Mabille & Rochebrune ; lon. 14.0 mm.; p. 367. 
Fie. 12. Lyonsia panamensis Dall; lon. 12.0 mm. ; p. 427. 
Fia. 13. Vesicomya lepta Dall, interior of right valve; lon. 15.0 mm. (young 
specimen); p. 416. 
FiG.14. External view of the same valve, about natural size for the adult. 
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Figures 13 and 14 were drawn by the late Dr. J. C. McConnell, the others by 
Miss Evelyn Mitchell. 
