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Dall (William Healey) On a new species of Yoldia from California.
[The Nautilus, vol.VII No.3.pp. 29-30. July 1893]
Contains a description of Yoldia montereyensis, dredged by the U.S Fish Commission, in the bay of Monterey California.

Dall (William Healey) Preliminary notice of new species of land shells from the Galapagos Islands collected by Dr. G Baur.
[The Nautilus, vol. VII, No.5. pp. 52-56.Sept.1893]
Bulimulus duncanus, B.amastroides var. Auceyi B.jacobi var. vermiculatus, B.olla, B. tortugamus, B.Bauri, Hyalima chathamensis, Conulus galapaganus, Succinea corbis and S.brevior are described as new. 

Dall (William Healey) Haeckel's Planktonic studies.