piiMished ill tlie order above indicated; but we have now 

 abandoned the former plan, and all the species enumerated in 

 the catalogue published now have been arranged according to 

 the newest classification of Mollusca. 



Of 1770 distinct species included in the catalogue, 3 

 belong to Cephalopoda, 968 to Gasteropoda. 430 to Pulmonata, 

 TO to Scaphopoda and 359 to Pelecypoda. 



Special thanks arc due to Mr. Matsuura and Mr. R. Saito 

 for the assiduous assistance in the preparation of the catalogue, 

 especially I am indebted to Mr. Matsuura, who kindly took 

 the trouble of proof reading. 



The abbreviations in parentliesis (I...), (F.) and (B.), an- 

 nexed after some families mean respectively Land shells,. 

 Fresh-water shells and Brackish-water shells ; all the other 

 families without sign are Marine shells. 



J. hvakaiva 



Curator of the Department of 

 Natural History. 



Tokyo Imperial Museum. 

 December, 1919. 



