Ai 



[Fig. 76. Ibycus minutus. 



A. Animal, from life, natural size, right side view. 



A 1. Ditto, from spirit-specimen, right side view. X 4. 

 A 2. Ditto, extremity of foot in life. A 4. Shell. X 2'4. 

 A 3. Jaw. X 20. A 5. Teeth of the radula. X about 625. 



Durgella assamica. 



B. Mantle-zone, removed from animal to show the shell- and dorsal 



lobes: enlarged. Bl. The genitalia : much enlarged. 



B 2. Portion of side of foot, to show the three peripodial grooves. 

 B 3. Three teeth of the radula. B 4. Jaw. X 15. 



C. Ibycus fissidens, teeth of radula (after Heynemann). 



D. Leptodontarion albacuminatus (after P. & F. Sarasin) : highly magnified. 



E. coriaceus (ditto) : ditto.] 



