PREFACE 



A catalogue of a portion of the Japanese shell specimens 

 in the Museum was published in 1909, forming tlie first part 

 of the conchological catalogue. It contained only Marine 

 Gasteropoda including Scaphopoda. The rest including Marine 

 Pelecypoda, Land shells and Fresh- water shells were to be 

 published later when the necessary arrangement and deter- 

 mination have been completed. Now as the identification of 

 the specimens except Amphineura and alcoholic specimens is 

 finished, we publish a catalogue of all the Japanese shells in 

 the Museum. 



For nearly ten years since the publication of the first 

 part of the catalogue, the specimens have been increasing 

 steadily. There were only 730 species of the Marine Uni- 

 valves included in the first catalogue ; now we have 935 

 distinct species and 86 varieties, with 33 still undetermined 

 ones, making 324 new additions to the class Gasteropoda in 

 our coUectioi;. As the collections grow and the malacological 

 investigations progress, it has been necessary that some of the 

 specific and even generic names should be changed. More- 

 over, as tlie species reidentifeid and those needing rearrange- 

 ment are not few in the former catalogue, we have newly 

 gone over the species of Gasteropoda revising all such points. 



In classifying the conchological specimens in the Museum, 

 we used to divide them for convenience' sake into four groups 

 of Marine Univalves, Marine Bivalves, Land shells and Fresh- 

 water shells. The catalogue already published was devoted 

 to the first group, and those of the other groups were to be 



