EXPLANATION OF PLATE LIU. 



Rotungia williamsoni, n. sp. 



Fig. r. — Shell, front view. X 45 . 



2. — Animal, the left side, showing protuberances on keel of 

 the foot. X 2. 



^j 3. — Animal, view of right front side, showing the right shell 

 lobe and dorsal lobes. X 2. 



J, 4. — Dorsal view of extremity of the foot. X 4*5. 



,, 5. — Generative organs. X 6. 



Macrochlamys hardwickei , G.-A. var. politulus, G.-A. 



Fig. 6.— Generative organs, the penis is drawn twice to show the 

 fiagellum. X 4*5. 



,, 7. — The edge of the visceral sac, right and left sides, showing 

 the shell and dorsal lobes. X 4"5. 



Macrochlamys albulus, n. sp. 



Fig. 8. — Animal, right and left sides, showing shell lobes. X 45. 

 ,, 9.— Jaw X 30. 



