MOLLUSCA OF INDIA. 85 



Durgella dekhanensis, var. bicolor. 



Fig. 3. Animal and shell, X 1'4. 



4. Jaw, X 24. 



5. Generative organs, X 4. 



Durgella levidensis, Godwin-Austen. Travancore. 



Fig. 6. Animal, viewed from the right side (spirit-specimen), X 4. 



7. Generative organs, X 4. 



7 a. Male organ, opened out on side, X 4. 



7 b. Ditto, end of, enlarged, side view. 



8. Four lateral teeth of odontophore, very much enlarged. 



8 a. The central tooth and outer laterals, X 368. 



9. The buccal mass, X 4. 



EXPLANATION OP PLATE liXXIX. 



Fig. 1. Durgella christiance,TlhQohL\\A: shell, X 4. Andaman Islands. 



2. Ditto : animal viewed from right side (from spirit-specimen). 



3. Ditto : jaw, X 124. 



4. Ditto : central tooth and adjacent teeth, much magnified. 

 4a, 4 6. Ditto: laterals, very much enlarged. 



5. Ditto : generative organs ; ? the probable position of the retractor 



muscle of the penis. 



6,6a. Durgella? sumbaensis, G.- A.: shell, X 4. Sumba or Sumbawa. 



6 b. Ditto : animal after soaking in water, showing the right shell- 

 lobe, X 4. 



7. Ditto: jaw, x 30. 



8. Ditto : central tooth and five median teeth. 

 8 a. Ditto : lateral teeth, very much enlarged. 



8 b. Ditto : the outer laterals, very much enlarged. 



9. Durgella hosei, G.-A. : central tooth and adjacent laterals. Borneo. 

 10. Durgella dekhanensis, G.-A. : extremity of foot, showing a super- 

 numerary overhanging lobe to mucous gland, X 4. South 

 India. 



EXPLANATION OF PLATE LXXX. 



Nilgiria solata, Benson. Nilghiri Hills. 



Fig. 1. Shell, X 1-5. 



2. Animal viewed from right side, showing edge of mantle and dorsal 



lobes, X 1"5. 

 2 a. Ditto, from left and front side, showing sole of foot, X 1'5. 



3. Extremity of foot, showing mucous gland, X 4. 



4. Generative organs, X 4. 



4 a. Generative (male) organ, X 8. 



Ariophanta Icevipes, Midler. Bombay. 



Fig. 5. Generative organs, amatorial organ detached, X 4. 



5 a. Ditto, portion of, showing spermatheca. 



5 b. Ditto, portion of male organ near junction of vas deferens, showing 

 spermatophore in situ, X 12. 



5 c. Ditto, terminal end of the amatorial organ, X 12. 



Hemiplecta humphreysiana. Lea. Singapur. 



Fig. 6. Animal, front view, showing shell- and dorsal lobes, X 2*4. 



6 a. Ditto, viewed from the left side, showing edge of mantle and left 



dorsal lobe, X 2-4. 

 6 b. The generative organs, nat. size. 



