PLATE L. 



[Part v.— June 1884.] 



Fig. 1. DiPLOMMATiNA OLTGOPLEURis, W. T. Blf. Tcria Ghat. Drawn from life, creeping 



and at rest. Enlarged. 

 2. DiPLOMMATiNA FOLLicuLUS, Pfr. Mussoorie. Tiie shell held in the hand, showing 



manner of protrusion of the rostrum and the various forms the animal assumes. 



Enlarged. 

 ;3. DiPLOMMATiNA iNsiGNis, G.-A., X 12. Spirit-specimcn. 



4. BLANFoKDiANA, Bs., X 12. Ditto. Western Bhutan. /, foot; o, operculum ; 



s.m, shell-muscle ; b.c, branchial sac. 



5. DiPLOMMATiNA BLANFORDiANA, Bs., X 20. Povtion of the hcad under slight 



pressure, showing : — ?•, radula; 6.^j, buccal plate; /, tentacle; e, eye; o, otolith? ; 



m, mantle, 

 ii a. Ditto : portion of buccal plate, x 360. 

 5b. Ditto: otoliths?, X 300. 



6. DiPLOMMATiNA INSIGNIS, G.-A. : poptiou of I'adula, X 360. 

 6a. Ditto: ditto. 



()b. Ditto: central and lateral teeth of radula in different positions. Very much 

 enlarged. 



7. DiPLOMMATiNA PACHYCHEiLXJS. Khasi Hills. Portion of the shell enlarged, showing 



the position of the operculum (o) and constriction (c) in the penultimate whorl, 

 the internal parietal rib or lamella (r), and the columellar twist or tooth {t). 



7 a. Ditto : ditto, another view. 



7 b. Ditto : vertical section anterior to the operculum. 



7 c. Ditto : horizontal section at the operculum, when withdrawn into shell to the fidl 



extent: the arrow shows the anterior side of same and direction towards the 

 aperture ; col, columella; rest of lettering same as above. 

 K. DiPLOMMATiNA BLANFORDiANA, Bs., X 12. Darjiliug. Showing similar construc- 

 tion. Front view. 



8 a. Ditto. Ditto. Viewed from side. 



9. DiPLOMMATiNA INSIGNIS, G.-A. : opcrculum, X 20. 



