320 PUOCEEDINGS OF THE MALACOLOO ICAL SOCIETY. 



With an equal number of wliorls P. cotyledonis measures 16 mm. in 

 diameter, whereas P. polystejyhes is only 12 mm. The markings are 

 also different. 



A large number of this species was collected by Mr. Feather and 

 forwarded alive, but they did not survive the journey. Whether any 

 of the specimens are quite mature is questionable. Under a 1 inch 

 objective there are distinct traces of microspically fine spiral strife 

 on the apical whorl. 



I have placed the type in the collection of the British Museum. 



