146 LAND AND FRESHWATER MOLLUSCA OF INDIA. 



EXPLANATION OP PLATE XCVIII. 

 Nilgiria ligulata, Ferussac. Madras. 



Fig. 1. Animal, view of right side, X 2. 



1 a. Eight side of mantle-zone, with right dorsal lobe, X 4-5. rec, rectum. 

 1 b. The mantle-zone, with right and left dorsal lobes, X 4-5. 

 1 c. Genitalia, X 4-5. ot, ovitheca. 



1 d. Sculpture of shell ou penultimate whorl, X 4-5. 



Nilgiria tranqueharira, Fabr. Madras. 

 Fig. 2. Oblique cut through the ovitheca, showing internal rugiu, X 12-r). 



2 a. Same above the cut, X 12-5. 



2 b. Sculpture of shell on last and penultimate whorls, X 4- j. 



Nilgiria cheiiiii, Pfr. Ceylon. 

 Fig. 3. Sculpture of shell 22 mm. behind the aperture, X 4-5. 



Ariophanta dalyi, W. T. Blf., subsp. {A. cgsis, var.) Mysore. 

 Fig. 4. Genitalia, X 4-5. 



Euplecta semidecussata, Pfr. Ceylon. 

 Fig. 5. Sculpture of shell, last Mhorl, X 8. 



EXPLANATION OF PLATE XCIX. 



Haught07iia covferta, Pfr. 



Fig. 1. The animal, viewed from the right side, X 2-2. 



2. The mucous pore, seen from behind, X 8. 



3. The mantle-edge and doi-sal lobes, detached, X 2. 



4. The mantle-edge in vicinity of the respiratory aperture, showing tlie 



rudimentary right shell-lobe, X 9. 



5. Genitalia, X 25. 



6 a. The male organ, from two different sides, X 4-5. 



5 b. Ditto, with lower muscular sheath cut open, X 8. 



6. The centre teeth of the radula, X 3(i5. 



6 a. The median at the 20th tooth to the 25th lateral, X 365. 

 6 b. The outermost laterals, X 365. 



7. The jaw, X 8. 



8. Sculpture of the shell, X 24. 



EXPLANATION OP PLATE 0. 



Khasiclla vidua, W. T. Blf. Munipur Hills. 



Fi". \. Animal, from the right side, mantle-zone removed, X 4'5. /, intestine; 

 b, integument covering branchial chamber. 

 1 a. Extremity of the foot, X 4-5. 

 1 b. Mantle-zone removed, showing right and dorsal shell-lobes, X 8. 



1 c. Ditto, showing the left shell- and dorsal lobes, X 8. 

 . 2. Shell, X 3. 



2 a. Portion of shell, to show the costulation, X 8. 



3. Genitalia, X 4-5. 



:\ a. The crecum of the male organ, X 8. 



4. Jaw. X 24. 



.^. Centre tooth and adjacent medians, X 365. 



ba. 14tli to 19ti) teeth, X 365. 



5 b. 20th to 23rd lateral teeth, X 365. 



5 c. Ditto, X 365. 



5 d. Outermost or marginal teeth, X 365. 



