TEE LIFE-HISTORY OF NUCTjr,A DELPHINODONTA. 387 



7. Kellogg. — "A Contribution to our Knowledge of the Morphology of 



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8. KowALEVSKY. — " Etudc sur I'embryogene du Dentale," 'Ann. Musee 



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9. Lacaze-Duthiers. — " Histoire de I'organisatiou et du developpement 



du Dentate," ' Ann. des Sci. Nat.,' series 4, tome vii, 1857. 



10. Milne-Edwaiids. — ' Le9ons sur la physiologic et I'anatomie comparee.' 



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 xxi, 1881. 



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Bd. vi, 1886. 



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Biol.,' tome xi, 1891. 



14. Pelseneer. ' Recherches morphologiques et phylogenetiques sur les 



Mollusques archaiques,' 1899. 



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Acad. Sci.,' Paris, tome cxi, 1890. 



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Suppl. 4, Fauna Chilensis, Heft 2, 1898. 



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Bd. xiii, 1899. 



19. Thiele. — "Die Stamniesverwandtschaft der MoUusken," 'Jen, Zeit. 



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Zool.,' Bd. xli, 1885. 



EXPLANATION OF PLATES 20—25, 



Illustrating Mr. Gilman A. Drew's paper on " The Life- 

 History of Nucula delphinodouta (Mighels)." 



Reference Letters. 



aa. Anterior adductor muscle, aas. Anterior adductor muscle-scar. ap. 

 Apical plate. bg. Byss:il gland, hs. Blood-space, ca. Cartilage, eg. 



