PART III 



GYMNOGLOSSA 



This third part, containing the Gymnoglossa of the Siboga Expedition, is much less bulky 

 than its predecessors, containing only 32 species, of which a few are new to science. It is a 

 very difhcult group, and I am much obliged to Mr. J. Cosmo Melvill for his liberal assistance 

 in naming and classifying the doubtful specimens and for procuring specimens for comparison. 



I wish here to express my acknowledgement to the library of Teyler's Institution at 

 Haarlem and its librarian, who has in the most obliging manner facilitated the use of the 

 conchological books, represented there in an unusual abundance. 



The classification of some specimens remained still a little doubtful, f. i. in the only 

 Eulimella and in one species of Elusa, even after making use of the papers of Dall and 

 Bartsch, who have recently made a special study of this section of mollusks. I have repeated 

 the descriptions of the new species of Mucronalia and Stilifer, from my monograph with 

 Dr. Nierstrasz, in order to render this part more complete, than it would have been, by simply 

 quoting them. For these species I have to thank Dr. J. Thiele for the loan of specimens 

 from the Zoological Museum of Berlin. 



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SI l'.OG A-EXPEDITIE XLÏX' C. 



