PLATE XXV. 



[Part W.^Septemher 1883.] 



Macrochlamys atricolor, G.-A. Munipur Hills. 



Fig. 1. Animal, spirit-specimen, showing mantle and shell-lobes, x 2-4. 



2. Ditto, viewed from right side, showing position as regards the shell, x 1"5. 



3. Ditto, mantle, viewed from left side, x 2-4. 



4. Entire animal, left side, x 2-4. 



5. Head, viewed from right side, showing position of generative aperture, x 2). 



6. Head, front view, showing form of mouth, x 4. 



7. Extremity of foot, viewed from behind, x 7. 



8. Mantle, viewed from below or inside, showing the division into two lobes. 



9. Same view of mantle in M. indica, Bs. Calcutta. 



10. Mantle of M. indica, viewed from the outside, showing the additional shell-lobe. 



