TLATE LXXXV. 



[Part IX.— November 1899.] 



Ratnadvipia irradians, Benson. Ceylou. 



Fig. 1. Animal, view of right side showing the slicll- and mantle-lubes, x 2 ij. 



2. Shell- and mantle-lobes, left side, 2'4. 



3. Sole of foot showing the medial fold atid segmentation, x in. 



4. The buccal mass, x 4. 



5. Shell from above, x 2'5. 

 5a. Ditto, side view, x 2u. 



G. Part of the genitalia : male and amatorial organs, x 2-."). 



6 a. Male organ, another view, x 2'o. 



7. Jaw, X 8. 



H. Teeth of radula, central and median, x 'M'tH. 



8 a. Ditto, outermost lateral.s, x 3G8. 



