PLATE LXXIX. 



[Part Yin.— Jamiari/ 1898.] 



Fig. 1. DuROELLA ciuusTiAN.E, Theobald : shell, x 4. Andaman Islands. 



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



3. Ditto : jaw, x 12- L 



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

 4a,-ib. Ditto: laterals, very much enlarged. 



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



the pcuis. 

 6,6 a. DuuQELLA? su.MU.VENsis, G.-A. : shell, x 4. Sinnba or Suinbawa. 



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. 

 H (I. Ditto: lateral teeth, very mufli enlarged. 



Hb. 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 supernumerary 



overhanging lobe to mucous gland, X 4. South India. 



