74 THE NAUTILUS. 



and differs from that species in the following respects: the 

 angular lamella does not emerge quite to the'edge of the peri- 

 stome, and it is continuous, not interrupted, within. The parie- 

 tal lamella is less remote from the lip-edge, emerging nearly 

 as far as the angular. The lower palatal plica is somewhat 

 stronger. 



The only specimen seen was among specimens of B. plicidens 

 (Pupa plicidens) received from Benson. 



Bifidaria plicidens will probably prove to be one of the most 

 widely distributed of Asiatic Pupillidge. Described originally 

 from Landour and Mussoorie, and subsequently reported from 

 Cherra Poonjee, Assam (Godwin-Austen), it has been found by 

 Mr. Y. Hirase at three Japanese localities Yoro, Mino ; Riozen, 

 Omi ; and Suimura,- Awa (Shikoku). I cannot see that the 

 specimens show any divergence from Indian examples. I do 

 not know that the species has been reported from China, but 

 there cannot be much doubt that it occurs there. Dr. von 

 Moellendorff has shown that another Japanese Bi/idaria, B. 

 firmigerella, has a wide range on the Chinese mainland. 



UNIO VIRIDIS CONRAD. 



BY BRYANT WALKER. 



The recent rediscovery by Mr. Frierson of the Appendix to 

 Conrad's New Fresh Water Shells is a very interesting one. 

 And in connection with it, it is also of interest to note that the 

 "hit or miss" method in naming a species adopted by Conrad 

 in reference to his subviridis has been explicitly approved by 

 the International Commission on Zoological Nomenclature. 

 (See Opinion 49). It seems clear that, barring the possible 

 reference of Rafinesque's viridis to this species, it must be known 

 as subviridis Con. , with tappanianus Lea as a synonym. 



But the identification of Rafinesque's viridis with the compressa 

 of Lea is by no means so sure as Mr. Frierson assumes, and I 

 desire to file an ' ' interference " , as the patent lawyers say, for 

 the purpose of suspending the general adoption of the change 



