PLATE XC. 



[Part IX.— November 1899.] 



For a description of the anatomy, see Vol. I. pp. 229-232. 



AusTENiA GioAs, Benson. Terai Ghat. 



Fig. 1. The male organ, showing the position in situ of tlie spermatophore in its 



passage outwards ( = fig. 2, pi. xxvi. P. Z. S. 1880), x 3. 



2. Ditto, showing capsule filled with spermatic coil ( = fig. 3, pi. xxvi. P. Z. S. 



1880), X 4. 



3. Ditto, spermatophores in the spermatheca, x 4. 



AosTENiA GiGAS, Small var. Khasi. 



Fig. 4. Broken portion of spermatophore, much enlarged ( = fig. 6, pi. xxiv. P. Z. S. 



1880). 



Adstenia BUTBERi, G.-A. Naga Hills. 

 Fig. 5. Shell { = fig. 9, pi. xxiv. P. Z. S. 1880), nat. size. 



6. Shell-lobes and mantle-lobes ( = fig. 1, pi. xxvi. P. Z. S. 1880). 



7. 7 a. Teeth of radula ( = fig. 10, pi. xxvii. P. Z. S. 1880), X 340. 



8. Jaw ( = fig. 9, pi. xxvii. P. Z. S. 1880), x 8. 



9. Generative organs ( = fig. 8, pi. xxvi. P. Z. S. 1880), nat. size. 



10. Cervicorn spines of the spermatophore ( = fig. 5, pi. xxvi. P. Z. S . 1880), x 20. 



7-»jP, retractor muscle of the male organ; vd, vas deferens; sp, spermatheca (portion 

 of the sac) ; a, a', anterior end of male organ ; b, base of capsule of spermatophore ; 

 c, junction of retractor muscle ; d, junction of vas deferens ; e, end of kalk-sac ; /.or, 

 part of free oviduct ; rsl, Isl, Idl, right and left shell- and dorsal lobes respectively. 



