igiQ-] N, Annandalk & B. Prashad : Fauna of Yunnan. 423 



of the undoubted Hydrobiid genus Pachydrobia , Crosse & Fischer) 

 as being not unlike those of Fenouilia in certain respects, 



ADDENDUM. 



Just as this paper was going to the press to be printed off, I 

 received through the courtesy of the Rev. Father Courtois, S.J., a 

 small but valuable collection of Chinese shells from the Zi-Ka Wei 

 College. It includes specimens of Delavaya rupicola, Heude, 

 apparently cotypes. These shells could not be separated geneti- 

 cally from Paraprososthenia coggini on conchological grounds, but 

 they seem to be specifically distinct. If Heude's figures are correct, 

 there are considerable differences in the radula and possibly the 

 anatomy, and should our species prove to be so closely related to 

 D. rupicola as it appears to be on shell-characters, the subgeneric 

 name Parapyrgula will have to give place to Delavaya, of which 

 Paraprososthenia will become a subgenus. The relationship between 

 Fenouilia and these forms may therefore be less close than we 

 thought, for no great reliance can be placed on apparent resem- 

 blances in the soft parts of dried specimens. I doubt in any case 

 that Delavaya is really congeneric with Pachydrobia. 



20th September, 1919. N. Annandale. 



